Seating Arrangement

ABSTRACT

A seating arrangement includes an upwardly-extending back arrangement movable between an upright and reclined positions, and a seat arrangement that includes a first link member extending horizontally and having forward and rearward portions, a second link member spaced from the first link member, a third link member coupled to the first and second link members and substantially flexible along a majority of a length thereof, and a fourth link member operably coupled to the first and second link members, the fourth link member being substantially rigid along a majority of a length thereof, wherein the link members cooperate to form a linkage arrangement, and wherein the seat arrangement moves in a rearward direction as the back arrangement is moved between the upright position and the reclined position.

TECHNICAL FIELD

Various embodiments relate to a seating arrangement, and in particular to a seating arrangement that includes various combinations of a pair of flexibly resilient shell members, a flexibly resilient support member and a rigid support member that cooperate to form a deformable and flexibly resilient four-bar linkage, and an active back arrangement having a movement that may be separated from movement of an associated seat support arrangement.

BRIEF SUMMARY

In one embodiment, a seating arrangement includes an upwardly extending back arrangement movable between an upright position and a reclined position, and a seat arrangement that includes a first link member extending substantially horizontally, the first link member having a forward portion and a rearward portion and configured to support a seated user thereon, a second link member spaced from the first link member, a third link member operably coupled to the forward portion of the first link member and to the second link member, the third link member being substantially flexible along a majority of a length thereof, and a fourth link member operably coupled to the rearward portion of the first link member and to the second link member, the fourth link member being substantially rigid along a majority of a length thereof. The first link member, the second link member, the third link member and the fourth link member cooperate to form a linkage arrangement, and the seat arrangement is configured to move in a rearward direction as the back arrangement is moved between the upright position and the reclined position.

In another embodiment, a seating arrangement includes a first shell member having a substantially horizontally-extending first portion and a second portion extending substantially upwardly from the first portion, the first portion including a forward portion, a rearward portion and a central portion located between the forward portion and the rearward portion, the second portion movable between an upright position and reclined positioned, and a second shell member having a substantially horizontally-extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending substantially upwardly from the first portion of the second shell member, the first portion of the second shell member including a forward portion and a rearward portion, the second portion of the second shell member movable between the upright position and the reclined position. The seating arrangement also includes a first link member extending between and operably coupled to the first portion of the of the first shell member and the first portion of the second shell member, and a second link member extending between the first portion of the first shell member and the first portion of the second shell member, the second link member being located rearwardly of the first link member. The first portion of the first shell member, the first portion of the second shell member, the first link member and the second link member cooperate to form a linkage arrangement. The central portion of the first portion of the first shell member flexes a greater amount than the rearward portion of the first portion of the first shell member, the rearward portion of the second shell member flexes a greater amount than the forward portion of the second shell member, the first link member flexes along a majority of a length of the first link member and the second link member remains substantially rigid along a majority of a length of the second link member as the second portion of the first shell member and the second portion of the second shell member are moved from the upright position to the reclined position.

In yet another embodiment, a seating arrangement includes a seat assembly that includes a substantially horizontally-extending first link member configured to support a seated user thereon, the first link member having a first end and second end, a second link member at least partially spaced from the first link member, the second link member having a first end and a second end, a third link member operably coupled to the first end of the first link member and the first end of the second link member, and a fourth link member operably coupled to the second end of the first link member and the second end of the second link member, such that the first link member, the second link member, the third link member and the fourth link member cooperate to form a linkage arrangement having an interior space. The seating arrangement further includes a back assembly extending substantially upward from the first link member and movable between an upright position and a reclined position, a support member positioned at least partially within the interior space of the four-bar linkage, the support member configured to remain substantially stationary with respect to a ground surface as the back assembly is moved between the upright position and the reclined position, and an arm support assembly that includes an armrest surface configured to support the arm of a seated user, the arm support assembly coupled to and supported by the support member such that the armrest surface remains substantially stationary with respect to a ground surface as the back assembly is moved between the upright position and the reclined position.

In still yet another embodiment, a seating arrangement includes a seat arrangement that includes a substantially horizontally-extending first link member configured to support a seated user thereon, the first link member having a first end and second end, a second link member at least partially spaced from the first link member, the second link member having a first end and a second end, a third link member operably coupled to the first end of the first link member and the first end of the second link member, and a fourth link member operably coupled to the second end of the first link member and the second end of the second link member, such that the first link member, the second link member, the third link member and the fourth link member cooperate to form a linkage arrangement. The seating arrangement further includes a back arrangement extending substantially upward from the first link member and movable between an upright position and a reclined position, the back assembly operably coupled to the seat arrangement such that the first link member moves between a forward position and a rearward position as the back arrangement is moved between the upright position and the reclined position, and a stop arrangement including a stop link having a first end and a second end, the first end operably coupled to at least one of the first link member, the second link and the fourth link member such that the first end of the stop link moves with the at least one of the first link member, the second link member and the third link member as the back arrangement moves between the upright position and the reclined position, wherein a travel of the second end is limited with respect to the second link member thereby limiting a rearward movement of the back assembly toward the reclined position, and wherein the stop arrangement further includes an elastically deformable stop member that is configured to limit a forward movement of the back arrangement toward the upright position.

In another embodiment, a seating arrangement includes a seat arrangement that includes a substantially horizontally-extending first link member configured to support a seated user thereon, the first link member having a first end and second end, a second link member at least partially spaced from the first link member, the second link member having a first end and a second end, a third link member operably coupled to the first end of the first link member and the first end of the second link member, and a fourth link member operably coupled to the second end of the first link member and the second end of the second link member, such that the first link member, the second link member, the third link member and the fourth link member cooperate to form a linkage arrangement having an interior space. The seating arrangement also includes a back arrangement extending substantially upward from the first link member and movable between an upright position and a reclined position, the back arrangement operably coupled to the seat assembly such that the first link member moves between a forward position and a rearward position as the back arrangement is moved between the upright position and the reclined position, and a stop arrangement positioned at least partially within the interior space of the four-bar linkage and including a stop member, and a first stop surface and a second stop surface each fixed with respect to at least one of the first link member, the third link member and the fourth link member, wherein the stop member is configured to abut the first stop surface thereby limiting a rearward movement of the back assembly as the back assembly is moved from the upright position toward the reclined position, and wherein the stop member is configured to abut the second stop surface thereby limiting a forward movement of the back arrangement as the back assembly is moved from the reclined position toward the upright position.

In another embodiment, a seating arrangement includes a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, and a flexibly resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member. The seating arrangement further includes a pair of flexibly resilient support members extending between and supporting the second portion of the first shell member from the second portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member and the pair of support members cooperate to form a four-bar linkage such that the first portion of the second shell member is movable between a forward position and a rearward position, wherein the first portion of the second shell member is more flexible than the first portion of the first shell member, and wherein the pair of flexible members are each more flexible than the first portion of the second shell member.

In another embodiment, a seating arrangement includes a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, wherein the first shell member comprises a polymer, and a flexibly resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member, wherein the second shell member comprises a polymer. The seating arrangement further includes a pair of flexibly resilient support members extending between and supporting the second portion of the first shell member from the second portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member and the pair of flexible members cooperate to form a four-bar linkage such that the first portion of the second shell member is movable between a forward position and a rearward position, wherein the pair of support members comprise a metal.

In yet another embodiment, a seating arrangement includes a flexibly resilient first shell member having a horizontally-extending first portion, a second portion extending upwardly from the first portion, and an arcuately-shaped transition portion located between the first portion and the second portion, and a flexibly resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell member, a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member, and an arcuately-shaped transition portion located between the first and second portions of the second shell member, wherein the second portion of the first shell member and the second portion of the second shell member are each movable between an upright position and a reclined position. The seating arrangement further includes a spacer member coupled to one of the first shell member and the second shell member and spaced from the other of the first shell member and second shell member when the second portion of the first shell member and the second portion of the second shell member are in the upright position, and wherein the spacer member abuts the transition portion of the other shell member when the second portion of the first shell member and the second portion of the second shell member are in the reclined position.

Still yet another embodiment includes providing a seating arrangement that includes a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position, and a flexibly resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell portion and movable between a forward position and a rearward position, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell and flexible between a first position and a second position. The seating arrangement further includes a link member coupling the second shell member to the second portion of the first shell member such that movement of the second portion of the first shell member from the upright position to the reclined position moves the first portion of the second shell member from the forward position to the rearward position, and such that flexing of the second portion of the second shell member does not move the first portion of the second shell between the forward position and the rearward position.

In another embodiment, a seating arrangement includes a flexibly resilient rear shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position, a back support member position forwardly of the second portion of the rear shell member and configured to support the back of a seated user, the back support member having an aperture extending therethrough, and a seat shell member configured to support a seated user and including a forward portion and a rearward portion extending though the aperture of the back support member and coupled to the second portion of the rear shell member such that moving the second portion of the rear shell member between the upright and reclined positions moves the seat shell member between a first position and a second position.

In yet another embodiment, a seating arrangement includes a flexibly resilient rear shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position, a flexibly resilient back support member positioned forwardly of the second portion of the rear shell member and configured to support the back of a seated user, and a seat shell member configured to support a seated user and including a forward portion and a rearward portion coupled to the second portion of the rear shell member such that moving the second portion of the rear shell member between the upright and reclined positions moves the seat shell member from a first position to a second position without flexing the back support member.

In still yet another embodiment, a seating arrangement includes a flexibly resilient rear shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position, a flexibly resilient back support member positioned forwardly of the second portion of the rear shell member and configured to support the back of a seated user, and a seat shell member configured to support a seated user, wherein moving the second portion of the rear shell member between the upright and reclined positions moves the seat shell member between a forward location and a rearward location. The seat arrangement further includes a pair of support members extending between and supporting the seat shell member from the second portion of the rear shell member, such that the first portion of the first shell member, the first section of the second shell member and the support members cooperate to form a four-bar linkage, wherein moving the second portion of the rear shell member between the upright and reclined positions moves the seat shell member between the forward and rearward positions without flexing the back support member.

In another embodiment, a seating arrangement includes a flexibly resilient rear shell member having a horizontally-extending lower portion, an upper portion extending upwardly from the lower portion, and a transition portion located between the lower portion and the upper portion, wherein the upper portion is movable between an upright position and a reclined position. The lower portion includes a U-shaped aperture having a base portion and a pair of arm portions extending forwardly from the base portion. The aperture is configured such that a portion of the rear shell member immediately adjacent to the base portion of the U-shaped aperture travels downwardly as the upper portion is moved from the upright position to the reclined position.

In yet another embodiment, a seating arrangement includes a flexibly resilient rear shell member supported by the support assembly and having a horizontally-extending lower portion, an upper portion extending upwardly from the lower portion, and a transition portion located between the lower portion and the upper portion, the upper portion movable between an upright position and a reclined position. The seating arrangement further includes at least one biasing member coupled to the lower portion of the rear shell member and the upper portion of the rear shell member and biasing the upper portion of the rear shell member from the reclined position to the upright position, and a first stop member that is fixed with respect to the lower portion of the rear shell member, and wherein the at least one biasing member includes a second stop member that abuts the first stop member when the upper portion of the rear shell member is in the reclined position.

In still yet another embodiment, a seating arrangement includes a flexibly resilient rear shell member having a horizontally-extending lower portion, an upper portion extending upwardly from the lower portion, and a transition portion located between the lower portion and the upper portion, wherein the upper portion is movable between an upright position and a reclined position. The lower portion includes a laterally-extending aperture that is configured such that a portion of the rear shell member immediately rearward to the aperture travels downwardly with respect to a portion of the rear shell member immediately forward of the aperture as the upper portion is moved from the upright position to the reclined position.

In still yet another embodiment, a seating arrangement includes a flexibly resilient first shell member having a horizontally-extending first position and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position, where the first portion includes an inner portion and at least one outer portion located laterally outward of the inner portion, and where the inner portion flexes a different amount than the outer portion as the second portion is moved between the upright and reclined positions. The seating arrangement further includes a flexible resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell member and movable between the upright position and the reclined position, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell, wherein a downward force on the inner portion of the first portion of the first shell member exerts a force on the second portion of the second shell from the recline position toward the upright position.

In still yet another embodiment, a seating arrangement includes a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the first portion configured to support a seated user and including a flexible tab member configured to flex independently from a majority of the first shell member, and the second portion configured to move between an upright position and a reclined position. The seating arrangement further includes a second shell member having a horizontally extending first portion at least partially spaced from the first portion of the first shell member, and a first support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member, wherein the support member is attached to the tab member of the first portion of the first shell member, and where the tab flexes a greater amount than the majority of the first portion of the first shell member as the second portion of the first shell member is moved from the upright position to the reclined position.

In another embodiment, a seating arrangement includes a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion of the first shell member movable between an upright position and a reclined position, and a flexibly resilient second shell member having a horizontally extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member, wherein the first portion of the second shell member includes a reduced thickness region where the thickness of the first portion of the second shell member is less than a thickness of the a majority of the first portion of the second shell member. The seating arrangement also includes a flexibly resilient first support member extending between and supporting the second portion of the first shell member from the second portion of the second shell member, where the first support member includes a reduced thickness region where the thickness of the first support member is less than a thickness of a majority of the first support member. The seating arrangement further includes a second support member extending between and supporting the second portion of the first shell member from the second portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member, first support member, and the second support member cooperate to form a four-bar linkage, and wherein the reduced thickness region of the first portion of the second shell member flexes more than the majority of the first portion of the second shell member and the reduced thickness region of the first support member flexes more than the majority of the first support member as the second portion of the first shell member moves from the upright to the reclined positions.

In yet another embodiment, a seating arrangement includes a base, a back arrangement configured to support a seated user and moveable between an upright position and a reclined position, and a seat arrangement configured to support a seated user. The seating arrangement further includes a control mechanism that supports the seat arrangement and back arrangement on the base and is configured to synchronously move the seat arrangement and the back arrangement as the back arrangement moves between the upright and recline positions, the chair control mechanism including a hollow element that includes a pair of walls that cooperate to define a cavity and a control rod, and the control rod being positioned to project into the cavity of the hollow element and interact with the pair of walls of the hollow element such that the control rod abuts one of the walls of the pair of walls when the back arrangement is in the upright position and the other wall of the pair of walls when the back arrangement is in the reclined position.

In still yet another embodiment, a seating arrangement includes a base, a back arrangement configured to support a seated user and moveable between an upright position and a reclined position, a seat arrangement configured to support a seated user, and a support arrangement that includes supported by the base including a stop arrangement configured to limit a movement of the back arrangement between the upright position and the reclined position, and that includes a coupling arrangement configured to couple a chair accessory to the support arrangement.

In another embodiment, a seating arrangement includes a base, a back arrangement and a seat arrangement supported by the base, where the back arrangement is movable between an upright position and a reclined position, and a shell supported on the base and forming at least a portion of the seat arrangement, where the shell has a substantially uninterrupted perimeter edge and a seating support region, a portion of the substantially uninterrupted perimeter edge of the shell defining a front edge section and another portion of the substantially continuous perimeter edge defining side edge sections rearward of the front edge section and adjacent the seating support region, and at least two slots are formed in the seating support region of the shell at a position spaced from the front edge section and generally adjacent to the side edge sections. The seating arrangement further includes a force activated control mechanism attached to the seating support region such that, upon movement of the chair into the recline position, the seating support region of the shell increases in height relative to the side edge sections of the shell.

In yet another embodiment, a seating arrangement includes a support assembly configured to abut a floor surface, an integral, one-piece support shell defining a back portion configured to support a seated user and seat portion configured to support a seated user, and a control member including a plurality of flexing regions and a plurality of support elements, where the one-piece support shell is supported in the seat portion by at least one of the plurality of support elements and at least one of the plurality of flexing regions both positioned forwardly of a connection point between the support assembly and the control member, and by at least one of the plurality of support elements and at least one of the plurality of flexing regions both positioned rearwardly of the connection point.

In still yet another embodiment, a seating arrangement includes a support shell including a seat portion configured to support a seated user and a chair back portion configured to support a seated user, the chair seat portion having a front region and a rear region and the chair back portion having an upper region and a lower region, where the rear region of the seat portion is coupled to the lower region of the chair back portion, and a control member including a front support and an attachment point for a second support, where the front support engages the support shell in the front region of the seat portion and the control member engages the back portion, wherein the control member is an integral, one-piece component including multiple flex regions configured to allow the support shell to move between an upright and reclined position.

In another embodiment, a seating arrangement includes a support shell that includes a back portion with an upper edge of a first width and a lumbar region of a second width, a seat portion with a front edge of a third width, and a transition portion, positioned between the chair back and chair seat portions, of a fourth width, and an upholstered cover comprising a similar first width, second width, third width, and fourth width. The seating arrangement further includes a support assembly, and a control member comprising a front support and a rear support and configured to allow the support shell to move between an upright and a reclined position, the control member coupled to the support shell through the front and rear supports and having a fifth width adjacent the rear support, wherein at least one of the first width, the second width, and the third width is greater than the fourth width, and the fourth width is greater than the fifth width.

In yet another embodiment, a seating arrangement includes a shell member that includes a seat portion configured to support a user, a back portion extending generally upward from the seat portion and movable between an upright position and a reclined position, and a transition portion located between the seat portion and the back portion, wherein at least a portion of the back portion, at least a portion of the seat portion and at least a first portion of the transition portion comprises a first thermoplastic polymer having a first flexibility, and wherein at least a second portion of the transition portion comprises a second thermoplastic polymer have a second flexibility that is greater than the first flexibility.

Various embodiments of the seating arrangements described here may provide a platform with the proper fit and function for comfortably supporting a seated user and may reduce or shift costs by reducing associated part counts, manufacturing costs, and labor costs. The seating arrangement includes an uncomplicated, durable, and visually appealing design capable of a long operating life, and particularly well adapted for the proposed use.

These and other features, advantages, and objects of various embodiments will be further understood and appreciated by those skilled in the art by reference to the following specification, claims, and appended drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an embodiment of a seating arrangement;

FIG. 2 is a cross-sectional side elevational view of the embodiment of the seating arrangement shown in FIG. 1 taken along the line II-II, FIG. 1;

FIG. 3 is a cross-sectional perspective view of the embodiment of the seating arrangement shown in FIG. 1 taken along the line II-II, FIG. 1;

FIG. 4a is a cross-sectional side elevational view of the embodiment of the seating arrangement shown in FIG. 1 shown in an upright position in solid line and in a reclined position in dashed line;

FIG. 4b is an enlarged cross-sectional side elevational view of another embodiment of a seating arrangement;

FIG. 5 is an enlarged perspective view of a first embodiment of a stop arrangement, wherein the associated seating arrangement is in a fully forward position;

FIG. 6 is an enlarged perspective view of the first embodiment of a stop arrangement, wherein the associated seating arrangement is in a fully reclined position;

FIG. 7 is an enlarged perspective view of an alternative embodiment of the stop arrangement, wherein the associated seating arrangement is shown in a fully reclined position;

FIG. 8 is an enlarged perspective view of the alternative embodiment of the stop arrangement, wherein the associated seating arrangement is shown in a fully forward position;

FIG. 9 is a perspective view of another embodiment of a seating arrangement;

FIG. 10 is a cross-sectional side elevational view of the embodiment of the seating arrangement shown in FIG. 9 taken along the line X-X, FIG. 9;

FIG. 11 is a cross-sectional perspective view of the embodiment of the seating arrangement shown in FIG. 9 taken along the line X-X, FIG. 9;

FIG. 12 is a bottom perspective view of yet another embodiment of the seating arrangement;

FIG. 13 is a bottom perspective view of still yet another embodiment of the seating arrangement, wherein the seating arrangement is in an upright position;

FIG. 14 is a bottom perspective view of the embodiment of the seating arrangement of FIG. 13, wherein the seating arrangement is in a reclined position;

FIG. 15 is a cross-sectional view of another embodiment of a seating arrangement;

FIG. 16 is a perspective view of yet another embodiment of a seating arrangement including a plurality of edge members;

FIG. 17 is a perspective view of another embodiment of a seating arrangement;

FIG. 18 is a cross-sectional view of the embodiment of the seating arrangement shown in FIG. 17 taken along the line XVIII-XVIII, FIG. 17;

FIG. 19 is a cross-sectional perspective view of the embodiment of the chair assembly shown in FIG. 17 taken along the line XVIII-XVIII, FIG. 17;

FIG. 20 is a cross-sectional side elevational view of yet another embodiment of the chair assembly;

FIG. 21 is a cross-sectional perspective view of the embodiment of the chair assembly shown in FIG. 20;

FIG. 22 is a perspective view of another embodiment of a seating arrangement;

FIG. 23 is a cross-sectional front perspective view of the embodiment of the seating arrangement shown in FIG. 22 taken along the lines XXIII-XXIII, FIG. 22;

FIG. 24 is a rear perspective view of the embodiment of the seating arrangement shown in FIG. 22;

FIG. 25 is a side elevation view of the embodiment of the seating arrangement shown in FIG. 22 with a back arrangement in an upright position in solid line and in a reclined position in dashed line;

FIG. 26 is a rear perspective view of another embodiment of the seating arrangement;

FIG. 27 is a rear perspective view of yet another embodiment of the seating arrangement;

FIG. 28 is a front perspective view of still another embodiment of the seating arrangement;

FIG. 29 is an enlarged perspective view of a recline limiting arrangement of the seating arrangement of FIG. 28;

FIG. 30 is a perspective view of another embodiment of a seating arrangement;

FIG. 31 is a side elevational view of the embodiment of the seating arrangement shown in FIG. 30 with a back assembly shown in an upright position in solid line and a reclined position in dashed line;

FIG. 32 is a perspective view of a back shell member;

FIG. 33 is a perspective view of the back shell member;

FIG. 34 is a cross-sectional side elevational view of the embodiment of the chair shown in FIG. 30, taken along the line XXXIV-XXXIV, FIG. 30;

FIG. 35 is a perspective view of the embodiment of the chair shown in FIG. 30 with a fabric cover removed;

FIG. 36A is a cross-sectional side elevational view of the embodiment of the chair shown in FIG. 30, taken along the line XXXVIA-XXXVIA, with the back assembly shown in the upright position;

FIG. 36B is a cross-sectional side elevational view of the embodiment of the chair shown in FIG. 30, taken along the line XXXVIA-XXXVIA, with the back assembly shown in the recline position;

FIG. 37 is a cross-sectional side elevational view of the embodiment of the chair shown in FIG. 30, taken along the line XXXVIII-XXXVIII, FIG. 35;

FIG. 38 is a perspective view of a stop member;

FIG. 39 is an exploded perspective view of another alternative embodiment of a seating arrangement;

FIG. 40 is an exploded perspective view of an accessory supporting arrangement;

FIG. 41 is an exploded perspective view of another alternative embodiment of a seating arrangement; and

FIG. 42 is a cross-sectional side view of the seating arrangement of FIG. 41

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

For purposes of description herein, the terms “upper,” “lower,” “rear,” “front,” “vertical,” “horizontal,” and derivatives thereof shall relate to the various seating embodiments as oriented in FIGS. 1, 9, 17 and 22. However, it is to be understood that certain embodiments may assume various alternative orientations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification are exemplary embodiments of the concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise. The various embodiments disclosed herein may be utilized within and incorporated into various seating arrangements, including office chares, general office seating, vehicle seating, home seating, aircraft seating, stadium seating, theater seating, and the like.

The reference numeral 10 (FIG. 1) generally designates an embodiment of a seating arrangement. In the illustrated example, the seating arrangement 10 is provided in the form of an office chair assembly and includes a cantered base or support assembly 12 supported above a ground or floor surface 14, a seat arrangement 16 and a back arrangement 18 each supported above the base assembly 12, and a pair of arm assemblies 20. The seating arrangement 10 (FIGS. 2 and 3) includes a front or first shell member 22 covered by a fabric layer 24 (FIG. 1) and a rear or second shell member 26. The shell members 22, 26 may be formed as a single, integral piece or comprise multiple, individual components. The shell members 22, 26 each comprise a flexibly resilient polymer material such as any thermoplastic, including, for example, nylon, glass-filled nylon, polypropylene, acetyl, or polycarbonate; any thermal set material, including, for example, epoxies; or any resin-based composites, including, for example, carbon fiber or fiberglass, thereby allowing each of the shell members 22, 26 to conform and move in response to forces exerted by a user. Other suitable materials may be also be utilized, such as metals, including, for example, steel or titanium; plywoods; or composite material including plastics, resin-based composites, metals and/or plywood. A variety of other suitable energy-storing materials may also be utilized. In some embodiments, shell members 22, 26 may comprise the same material or materials, while in certain embodiments, shell members 22, 26 may each comprise a different material or materials.

The front shell member 24 includes a horizontally-extending bottom or first portion or first link member 28, a vertically-extending upper or second portion 30 extending upwardly from the first portion 28, and an arcuately-shaped transition portion 32 extending between the first portion 28 and the second portion 30. The first portion 28 includes a forward portion 34, a rearward portion 36 and a central portion 38 located therebetween and extending laterally across the first portion 28. A pair of laterally-extending reliefs or apertures 40 are located within the central portion 38 and divide the forward portion 34 from the rearward portion 36 as further described below. The second portion 30 includes a lower portion 44, an upper portion 46 and a mid-portion 48 located therebetween that may be arcuately-shaped and forwardly convex so as to support the lumbar region of a user's back. It is noted that the front shell member 24 may alternatively be referred to herein as the forward shell member, the first shell member, the support member or support shell member, and the top shell or shell member.

The rear shell member 26 includes a horizontally-extending bottom or first portion or second link member 50 supported by a height adjustable pneumatic cylinder 12 a at a connection point 12 b, a vertically-extending upper or second portion 52 extending upwardly from the first portion 50, and an arcuately-shaped transition portion 54 extending between the first portion 50 and the second portion 52. Preferably, the rear shell member 26 comprises carbon fiber, however, other materials may also be utilized as described above. The second portion 52 of the rear shell member 26 includes a lower portion 56, an upper portion 58 and a mid-portion 60 located therebetween that may be arcuately-shaped and forwardly convex. The upper portion 58 of the second portion 52 of the rear shell member 26 is connected to the upper portion 46 of the second portion 30 of the front shell member 22 at a location 62, such as by sonic welding, an adhesive, integral molding, mechanical fasteners, and the like. It is noted that the rear shell member 26 may alternatively be referred to herein as the rearward shell member, the second shell member, the bottom shell or shell member, or the control arrangement. The front shell member 22 and the rear shell member 26 are configured so as to define a gap 64 between at least a portion of the upper portion 30 and upper portion 52, between the mid-portion 48 and the mid-portion 60, between the lower portion 44 and the lower portion 56, between the transition portion 32 and the transition portion 54, and/or between the first portion 28 and first portion 50. In certain embodiments, the front shell member 22 and the rear shell member 26 may be connected at the lower portions or mid-portions of their respective second portions 30 and 52 or at their respective transition portions 21 and 54. For example, the front shell member 22 and the rear shell member 26 may be connected at their respective lower portions 44 and 56 such that seating arrangement 10 essentially has a single shell second portion with a gap 64 between the first portions 28 and 50.

The seating arrangement 10 further includes a laterally-extending, flexibly resilient forward support member 66, and a laterally-extending, rigid rearward support member 68, each extending between the first portion 28 of the front shell member 22 and the first portion 50 of the rear shell member 26. In the illustrated example, the forward support member 66 is integral and forms a single-piece with the first portion 50 of the rear shell member 26, while the rearward support member 68 is formed as and is a separate piece from the front shell member 22 and the rear shell member 26. However, either or both the forward support member 66 and the rearward support member 68 may be formed integrally with or as a separate piece from the front shell member 22 and/or the rear shell member 26. In the present example, the rearward support member 68 preferably comprises a rigid, relatively lightweight carbon fiber, however, other material or materials may also be utilized depending on the application, including those listed above with respect to the front and rear shell members 24. The rearward support member 68 includes a body portion 70, an upper flange 72 secured to a bottom surface 74 of the first portion 28 at a location 74 a, and a lower flange 76 secured to an upper surface 78 of the first portion 50 at a location 78 a. The upper flange 72 and the lower flange 76 are secured to the first portion 28 and the first portion 50 by sonic welding, an adhesive, mechanical fasteners, friction fit and the like. Both the forward support member 66 and the rearward support member 68 angle forwardly from bottom to top, while the forward support member 66 includes a V-shaped notch or aperture 80 extending therethrough. In certain embodiments, the forward support member 66 may include one or more apertures, notches, or slots of varying shapes in order to promote a desired flexibility of the support member. Similarly, in some embodiments, the forward support member 66 may be a solid member shaped to promote a desired flexibility. The various configurations of the rear shell member as described herein, whether provided as a single, integral, one-piece unit or as a multiple-piece assembly allows the rear shell member to act as a control member to control various recline movements and support characteristics of the front shell member.

In operation, a user can move or recline the back arrangement 18 (FIG. 4a ), including the second portion 30 of the front shell member 22 and the second portion 52 of the rear shell member 26, from an upright position A to a reclined position B by flexing the front shell member 22 and the rear shell member 26. The first portion or first link member 28, the first portion or second link member 50, the forward support member or third link member 66 and the rearward support member or fourth link member 68 cooperate to form a four-bar linkage arrangement such that movement of the second portion 30 of the first shell member 22 and the second portion 52 of the rear shell member 26 from the upright position A to the reclined position B causes the first portion 28 of the front shell member 22 to move rearward and to a reclined position. It is contemplated that the four-bar linkage arrangement as used and described herein is inclusive of linkage arrangements comprising additional linkage members, such as five-bar linkage arrangements, six-bar linkage arrangements, and the like. FIG. 4 illustrates in solid line the first portion 28 of the front shell member 22 in a substantially horizontal orientation C when not acted upon by external forces, such as a force exerted by a seated user. The apertures or reliefs 40 allow the rearward portion 36 to rotate more rapidly and to a greater recline angle than the forward portion 34 during recline of the back arrangement 18. Specifically, the forward portion 34 is moved from the position C to a rearward and reclined position D, while the rearward portion 36 of the first portion 28 is moved from the position C to a rearward and more reclined position E. In certain embodiments, apertures 40 may be positioned in first portion 28, either in the central portion 38, forward portion 34, or rearward portion 36, so as to achieve a desired rotation and recline angle during the recline of back arrangement 18. It is further noted that the rearward support member 68 remains rigid or substantially rigid during the entire recline movement of the seating arrangement 10, while most deformation of the front shell member 22 and the rear shell member 26 occur in a portion 82 of the rear shell member 26 just forward of the location at which the rearward support member 68 is connected to the rear shell member 26, in the central portion 38 of the first portion 28 of the first shell member 22, and in the forward support member 26. Further, in some instances, the fourth link 68 may include at least a portion of the back arrangement 18. In various embodiments, the thickness of one or more links may be determined to achieve a desired performance characteristic, including for example, the flexibility of the link. Further, in certain embodiments, the thickness of a link may vary along the length of the link to achieve a desired flexibility or rigidity across the link or in a localized portion of the link. For example, the first link member 28, the second link member 50 and the forward link member 66 may all be more flexible than the rear link member 68 to achieve the desired flexibility of the four-bar linkage. In some embodiments, the various links may be more flexible in a particular portion or localized area of the link such that the links are generally flexible in the localized area and are generally not flexible or less flexible in any other area of the link. An example of this embodiment is illustrated in FIG. 4b where certain portions of the first link member 28, the second link member 50, and the third link member 66 include certain portions with a reduced relative thickness. Specifically, in the illustrated example, the first link member 28 includes an area of reduced thickness or flexing region or flexing zone 29 located in the central portion thereof, the second link member 50 includes an area of reduced thickness or flexing region or flexing zone 51 positioned rearward of the location at which the fourth link member attaches to the second link member 50, and the third link member 66 includes an area of reduced thickness or flexing region or flexing zone 67. It is noted that the relative areas of reduced thickness may extend along a short distance or the majority of the length of the associated link depending upon the support and bending characteristics desired.

The seating arrangement 10 further includes a support member 84 (FIGS. 1-3) at least partially located within an interior space 86 defined by the four-bar linkage arrangement, namely, the first link member 28, the second link member 50, the third link member 66 and the fourth link member 68. In the illustrated example, the support member 84 includes an open, loop-shaped body portion 86, the forward portion of which extends into the interior space 86, and the rearward portion of which is configured to support the arm assemblies 20. As best illustrated in FIG. 2, each arm assembly 20 includes an arm support member 92 integrally formed with and extending upwardly from the rear portion of the body portion 88 of the support member 84. An arm cap 94 is secured to an upper end of the arm support member 92 and may be moveable adjustable with respect thereto. As best illustrated in FIG. 4, it is noted that the support member 84 and the arm assemblies 20 are grounded and remain substantially stationary as the back arrangement 18 is moved from the upright position A to the reclined position B.

The reference numeral 10 a (FIG. 5) generally designates another embodiment of a seating arrangement, having a stop arrangement 100. Since the seating arrangement 10 a is similar to the previously described seating arrangement 10, similar parts appearing in FIGS. 1-4 and FIGS. 5 and 6 respectively are represented by the same, corresponding reference numeral, except for the suffix “a” in the numerals of the latter. In the illustrated example, the stop arrangement 100 includes a bushing assembly 102 positioned between the body portion 88 a and the rearward support member 68 a. The bushing assembly 102 includes an elastically deformable bushing member 104, a sleeve member 106 extending about the bushing member 104, and a stop link 108 slidably extending through a centrally disposed aperture 110 of the bushing member 104 and having a first end fixably coupled to the rearward support member 68 a and a second end 112 slidably received within an interior of the body portion 88 a of the support member 84 a. A stop plate 114 is affixed to the second end 112 of the stop link 108.

In operation, the bushing member 104 is compressed between the body portion 88 a of the support member 84 a and the rearward support member 68 a as the back arrangement is moved in a forward direction from the reclined position to a fully forward upright position, thereby limiting the forward movement of the back arrangement. As the back arrangement is moved from the upright position to the reclined position, the stop link 108 is drawn from within an interior of the body portion 88 a until the stop plate 114 abuts an inner surface 116 of the body portion 88 a, thereby limiting movement of the rearward support member 68 a and thus the rearward movement of the back assembly from the upright position toward the reclined position.

The reference numeral 10 b (FIGS. 7 and 8) generally designates another embodiment of a seating arrangement, having a stop arrangement 100 b. Since the seating arrangement 10 b is similar to the previously described seating arrangement 10 a, similar parts appearing in FIGS. 5 and 6 and FIGS. 6 and 7 respectively are represented by the same, corresponding reference numeral, except for the suffix “b” in the numerals of the latter. In the illustrated example, the stop arrangement 100 b includes a stop member 120 located within the interior space 86 b. The stop member 120 is secured to an upper surface 78 b of the first portion 50 b of the rear shell member 26 b and extends upwardly therefrom into the interior space 86 b positioned between the first link member 28 b, the second link member 50 b, the third link member 66 b and the fourth link member 68 b. The stop member 120 includes an upper or first stop surface 122 and a forward or second stop surface 124. A stop bracket 126 is secured to the bottom surface 74 b of the first portion or first link member 28 b, and includes a first portion 128 extending substantially parallel with the first portion or first link member 28 b, and a second portion 130 extending orthogonally downward from the first portion 128. Elastically deformable abutment pads 132 are attached to the first portion 128 and the second portion 130.

In operation, the stop member 120 is configured to abut the pad 132 attached to the first portion 128 as the back assembly is moved from the reclined position toward a fully forward position, thereby limiting the amount of forward travel of the first portion or first link member 28 b and the back assembly 12 in the forward direction. The stop member 120 is further configured such that the forward stop surface 124 contacts the pad 132 attached to the second portion 130 when the back arrangement is moved from the upright position to the reclined position, thereby limiting the amount of rearward travel of the first portion or first link member 28 b and the back arrangement in the rearward direction.

The reference numeral 200 (FIG. 9) generally designates another embodiment of a seating arrangement. In the illustrated example, the seating arrangement or chair assembly 200 includes a cantered base assembly 202 abutting a floor surface 204, a seat assembly 206 and a back assembly 208 each supported above the base assembly 202, and a pair of arm assemblies 210. In the illustrated example, the chair assembly 200 (FIGS. 10 and 11) includes a front or a first shell member 214 and a rear or second shell member 212. The shell members 212, 214 may be formed as a single, integral piece or comprise multiple, individual components. The shell members 212, 214 each comprise a flexibly resilient polymer material such as any thermal plastic, including, for example, nylon, glass-filled nylon, polypropylene, acetyl, or polycarbonate; any thermal set material, including, for example, epoxies; or any resin-based composites, including, for example, carbon fiber or fiberglass, thereby allowing each of the shell members 212, 214 to conform and move in response to forces exerted by a user. Although a polymer material is preferred, other suitable materials may also be utilized, such as metals, including, for example, steel or titanium; plywood; or a composite material including plastics, resin-based composites, metals and/or plywood. A variety of other suitable energy-storing materials may also be utilized.

The rear shell member 212 includes a horizontally-extending bottom or first portion 216, a vertically-extending upper or second portion 218 extending upwardly from the first portion 216, and an arcuately-shaped transition portion 230 extending between the first portion 216 and the second portion 218. In the illustrated example, the first portion 216 is supported by a support plate 232 that abuts a bottom surface 234 of the first portion 216, and which is in turn supported by a column 236 of the pedestal assembly 202. In the illustrated example, the column 236 comprises a pneumatic height adjustment cylinder. The second portion 218 of the rear shell member 212 includes a lower portion 238, an upper portion 240 and an arcuately-shaped, forwardly convex mid-portion 242 located therebetween.

The front shell member 214 includes a horizontally-extending bottom or first portion 244, a vertically-extending upper or second portion 246 extending upwardly from the first portion 244, and an arcuately-shaped transition portion 248 extending between the first portion 244 and the second portion 246. The first portion 244 includes a forward portion 250 and a rearward portion 252, while the second portion 246 includes a lower portion 254, an upper portion 256 and an arcuately-shaped, forwardly convex mid-portion 258 located therebetween and configured to support the lumbar region of a user's back. The upper portion 256 of the second portion 246 of the front shell member 214 is connected to the upper portion 240 of the second portion 218 of the rear shell member 212 at a location 260, such as by sonic welding, an adhesive, integral molding, mechanical fasteners, and the like. The second shell member 212 and the first shell member 214 are configured so as to define a gap 262 between at least a portion of the upper portion 256 and the upper portion 240, between the mid-portion 258 and the mid-portion 242, between the lower portion 254 and the lower portion 238, between the transition portion 248 and the transition portion 230, and between the second portion 246 and the second portion 218.

The chair assembly 200 further includes a pair of laterally-extending, flexibly resilient support members, including a forward support member 262 and a rearward support member 264, each extending between the second portion 246 of the first shell member 214 and the second portion 218 of the second shell member 212. In the illustrated example, the forward support member 262 and the rearward support member 264 are integrally formed within a single spring member 266, however, the forward support member 262 and the rearward support member 264 may be formed as separate pieces, or as integral portions of the second shell member 212 and/or the first shell member 214. In the present example, the spring member 266 comprises a single sheet of metal material shaped to include the forward support member 262, the rearward support member 264, a support portion 268 attached to an underside or bottom surface 270 of the second portion 246 of the first shell member 214, and a pair of connection portions 272 extending rearwardly from the associated forward support member 262 and rearward support member 264. The connection portions 272 are secured to a spring stop member 274 which is described below. Alternatively, the connection portions 272 of the spring member 266 may be attached directly to an upper surface 276 of the second portion 218 of the second shell member 212. In the illustrated example, the connection portion 272 associated with the rearward support member 264 is attached to an upper surface of the spring stop member 274, while the connection portion 272 of the forward support member 262 is attached to and spaced from the upper surface of the spring stop member 274 by a spacer member 278 that is in turn attached to the upper surface of the spring stop member 274.

In operation, a user can move or recline the second portion 218 of the second shell member 212 and the second portion 246 of the first shell member 214 from an upright position A to a reclined position B by flexing the second shell member 212 and the first shell member 214. Movement of the second portion 218 of the second shell member 212 and the second portion 246 of the first shell member 214 from the upright position A to the reclined portion B causes the first portion 244 of the first shell member 214 to move from a first position C to a rearward and reclined position D. Specifically, the first portion 216 of the second shell member 212, the first portion 244 of the first shell member 214, the forward support member 262 and the rearward support member 264 cooperate to form a flexible or deformable four-bar linkage allowing movement of the second portion 246 of the first shell member 214 to the first position C to the reclined position D. In some embodiments, the forward support member 262 and the rearward support member 264 are each more flexible than the second portion 246 of the first shell member 214, and the second portion 246 of the first shell member 214 is more flexible than the second portion 218 of the second shell member 212. In other embodiments, the various thicknesses of the links or members comprising the deformable four-bar linkage may vary so as to provide specific support and bending characteristics as previously described. It is noted that the deformable four-bar linkage does not include specific pivot assemblies and the components typically associated therewith, thereby reducing the complexity of the overall system. The spring member 266 is configured to return the four-bar linkage to the original position once the external force is removed. In the illustrated example, the forward support member 262 and the rearward support member 264 are substantially the same length, however as noted above, the connection portion 272 of the forward support member 262 is spaced from the spring stop member 274 or the upper surface 276 of the second portion 218 of the second shell member 212 by the spacer member 278, thereby effectively changing the moment arm length of the forward support member 262. As a result, the forward portion 250 of the second portion 246 of the first shell member 214 rises at a greater rate than the rearward portion 258 of the second portion 246 as the second portion 246 of the first shell member 214 is moved from the first position C to the reclined position D.

The spring stop member 274 includes a body portion 280 attached to the upper surface 276 of the second portion 218 of the second shell member 212, a forward stop portion 282 extending angularly forward and upward from the body portion 280, and a rearward stop portion 284 extending angularly rearward and upward from the body portion 280. The forward stop portion 282 is configured such that the forward support member 262 contacts the forward stop portion 282 thereby limiting the forward movement of the forward support member 262. In the illustrated example, the forward stop portion 282 is substantially flexible, thereby providing a spring effect or cushioning to the forward movement of the forward support member 262. However, the forward stop portion 282 may also comprise a substantially rigid material. The rearward stop portion 284 includes an arcuately-shaped upper end 286, and a mid-portion 288 that includes a vertically-extending slot 290. In operation, the upper end 286 is configured to abut the transition portion 248 of the first shell member 214, thereby limiting the rearward travel of the transition portion 248 with respect to the transition portion 230. In the illustrated example, the upper end 286 and the mid-portion 288 of the spring stop member 274 are flexibly resilient, so as to provide a soft-stop or cushioning to the rearward motion of the transition portion 248 to the transition portion 230.

A spacer 292 is positioned between the transition portion 230 of the second shell member 212 and the transition portion 248 of the first shell member 214. In the illustrated example, the spacer 292 includes an arcuately-shaped body portion 294 having a rearwardly-facing arcuately-shaped abutment surface 296, wherein the abutment surface 296 is complementary to the shape of the transition portion 230 of the second shell member 212. The spacer 292 further includes an arm portion 298 and a forward abutment portion 300 located at a distal end of the arm portion 298. The forward abutment portion 300 includes a forwardly-facing arcuately-shaped forward abutment surface 302 that abuts and is complementary to the shape of the transition portion 248 of the first shell member 214. The forward abutment portion 300 is secured to the transition portion 248 of the first shell member 214 by a plurality of mechanical fasteners such as bolts 304. In operation, the abutment surface 296 is spaced from the transition portion 230 of the second shell member 212 when the second shell member 212 and the first shell member 214 are in the upright position A. The abutment surface 296 moves rearwardly toward the transition portion 230 of the second shell member 212 as the second shell member 212 and the first shell member 214 are moved from the upright position A toward the reclined position B, until the abutment surface 296 abuts the transition portion 230, thereby reducing the total amount of flexure possible of the second shell member 212 and the first shell member 214 and maintaining a structural shape to the transition portion 230 and the transition portion 248. The spacer 292 further includes a stop member 306 extending upwardly from a forward end of the body portion 294 and received within the slot 290 of the mid-portion 288 of the spring stop member 274. The stop member 306 abuts an upper end of the slot 290, thereby providing a limit to the rearward recline of the second shell member 212 and the first shell member 214.

Alternatively, a chair assembly 200 c (FIG. 12) may be provided with a pair of reinforcement plates that structurally support and secure the connection portion 272 c of the spring member 266 c to the second portion 246 c of the first shell member 214 a. Since the chair assembly 200 c is similar to the previously described chair assembly 200, similar parts appearing in FIGS. 9-11 and in FIG. 12 respectively are represented by the same, corresponding reference numeral, except for the suffix “c” in the numerals of the latter. As illustrated, the chair assembly 200 c includes an upper reinforcement or support plate 308 positioned above the connection portion 272 c of the spring member 266 c, and a lower or second support plate 310 positioned below the connection portion 272 c of the spring stop member 274 c, thereby sandwiching the connection portion 272 c therebetween. The plates 308, 310 and the second portion 272 c of the spring member 266 c are coupled to the first portion 244 c of the second shell member 214 a by a plurality of mechanical fasteners such as bolts 312. The plate 308 may also be configured to support the arm assemblies 210 c.

Another alternative embodiment is illustrated in FIG. 13, wherein the chair assembly 200 d includes an upright stop member 314. Since the chair assembly 200 d is similar to the previously described chair assembly 200, similar parts appearing in FIGS. 9-11 and FIG. 13 are respectively represented by the same, corresponding reference numeral, except for the suffix “d” in the numerals of the latter. The upright stop member 314 includes a substantially rectangular block-shaped body portion 316 having a proximal end 318 secured to the first portion 216 d of the second shell member 212 d, and a distal portion 320. The upright stop member 314 further includes a pair of stop members such as pins 322 extending laterally outward from the distal portion 320. As best illustrated in FIG. 13, the body portion 294 d of each of the spacers 292 d are spaced from the associated pins 322 when the second shell member 212 d and the first shell member 214 d are in the upright position. As best illustrated in FIG. 14, the spacers 292 d rotate rearwardly with the transition portion 248 d of the first shell member 214 d until an upper surface 324 of the body portion 294 d of each of the spacers 292 d contact or abut the pins 320, thereby preventing the second shell member 212 d and the first shell member 214 d from further reclining.

In another alternative embodiment, a chair assembly 200 e (FIG. 15) includes an alternative stop arrangement 326. In the illustrated example, the chair assembly 200 e is similar to the chair assembly 200, with the most notable exception being an alteration to the rearward stop arrangement. Since the chair assembly 200 e is similar to the chair arrangements 200, 200 c, similar elements appearing in FIGS. 1-4 and FIG. 7 are represented by the same corresponding reference numeral, except for the suffix “e” in the numerals of the latter. The stop arrangement 326 includes a mounting member 328 fixedly secured to the first portion 216 e and a stop member 330 secured to a distal end 332 of the mounting member 328. In operation, the rearward support member 264 e abuts the stop member 330, thereby limiting rearward “recline” of the chair back.

In still another alternative embodiment, a chair assembly 200 f (FIG. 16) includes a plurality of flexibly resilient edge members 334. Since the chair assembly 200 f is similar to the previously described chair assembly 200, similar parts appearing in FIGS. 9-11 and FIG. 16, respectively are represented by the same, corresponding reference numeral, except for the suffix “f” in the numerals of the latter. In the illustrated example, the bottom or first portion 216 f of the second shell member 212 f provides a trough-like shape and includes sidewalls 336 and a front wall 338. The plurality of edge members 334 extend between the sidewalls 336 and/or the front wall 338 and the first portion 244 f of the first shell member 214 f. Each edge member 334 comprises a flexibly resilient polymer material and is positioned so as to contact an inside surface of the sidewalls 336 and/or the front wall 338 and the bottom surface of the second portion 244 f of the second shell member 214 f, and are secured thereto by a plurality of mechanical fasteners such as screws 340. In some embodiments, edge members 334 may be formed integrally with second shell member 212 f and/or first shell member 214 f. The edge members 334 may or may not be provided with a plurality of longitudinally-extending slots 342, which may alter the performance of the members. For example, increasing the number and/or size of the slots 342 may increase the flexibility of the members 334. The edge members 334 may additionally provide a surface between the second shell member 212 f and the first shell member 214 f to support an associated cover member (not shown), as well as to prevent access to the gap 262 f between the second shell member 212 f and the first shell member 214 f.

The reference numeral 400 (FIG. 17) generally designates another embodiment of a seating arrangement. In the illustrated example, the seating arrangement 400 includes a cantered base assembly 402 abutting a floor surface 404, a seat assembly 406 and a back assembly 408 supported above the base assembly 402, and a pair of arm assemblies 410.

The chair assembly 10 includes a rear or second shell member 422 (FIGS. 18 and 19) and a front or first shell member 424. The shell members 422, 424 may be formed as a single integral piece or comprise multiple, individual components. In the illustrated example, the shell members 422, 424 each comprise one or more flexibly resilient polymer materials such as any thermal plastic, including, for example, nylon, glass-filled nylon, polypropylene, acetyl, or polycarbonate; any thermal set material, including, for example, epoxies; or any resin-based composites, including, for example, carbon fiber or fiberglass, thereby allowing each of the shell members 422, 424 to conform and move in response to forces exerted by a user. Although a polymer material is preferred, other suitable materials may also be utilized, such as metals, including, for example, steel or titanium; plywood; or a composite material including plastics, resin-based composites, metals and/or plywood. A variety of other suitable energy-storing materials may also be utilized.

The rear shell member 422 includes a horizontally-extending bottom or first portion 426, a vertically-extending upper or second portion 428 extending upwardly from the first portion 426, and a transition portion 429 extending between the first portion 426 and the second portion 428. In the illustrated example, the first portion 426 is supported by a support plate 430 that abuts a bottom surface 432 of the first portion 426, and which is in turn supported by a column 434 of the pedestal assembly 402. The second portion 428 of the rear shell member 422 includes a lower portion 436, an upper portion 438 and a mid-portion 440 located therebetween. The upper portion 438 of the rear shell member 422 is separated from the mid-portion 440 by a gap 442, thereby allowing the upper portion 438 to move independently from the mid-portion 440, as described below.

The front shell member 424 includes a first portion or seat shell member 444 and a second portion or back support member 446. The seat shell member 444 includes a forward portion 448, a rearward portion 450, an upper surface 452 configured to support a seated user, and a lower surface 454 opposite the upper surface 452. The back support member 446 includes a lower portion 456, an upper portion 458 and a mid-portion 460 located therebetween. The mid-portion 440 of the rear shell member 422 and the mid-portion 460 of the back support member 446 are coupled together by a laterally-extending rib 462 that extends forwardly from a forward surface 464 of the rear shell member 422 and rearwardly from a rearward surface 466 of the back support member 446. The rearward portion 450 of the seat shell member 444 is coupled to the second portion 428 of the rear shell member 422 by a link member 468. In the illustrated example, the link member 468 is integrally formed with both the rear shell member 422 and the seat shell member 444, however, each of these components may be formed as individual, single pieces. A lower end of the lower portion 456 of the back support member 446 extends through an aperture or slot 470 formed within the link member 468 and couples to an underside 472 of the link member 468 after passing through the aperture 470.

The seating arrangement 400 further includes a pair of laterally-extending, flexibly resilient support members including a forward support member 474 and a rearward support member 476 each extending between the seat shell member 444 and the second portion of the rear shell member 422. In the illustrated example, the support members 474, 476 are integrally formed with the seat shell member 444 and the rear shell member 422, and extend from the lower surface 454 of the seat shell member 444 to an upper surface 478 of the first portion 426 of the rear shell member 422, however each of these components may comprise individual pieces. The first portion 426 of the rear shell member 422, the seat shell member 444 and the pair of support members 474, 476 cooperate to define a deformable four-bar linkage allowing movement of the seating arrangement 400 as described below. In the illustrated example, the front support member 474 is slightly longer than the rear support member 476, the relevance of which is also described below.

In operation, a user can move or recline the second portion 428 of the rear shell member 422 from an upright position A to a reclined position B by flexing the rear shell member 422 and the front shell member 424. Movement of the second portion 428 of the rear shell member 422 from the upright position A to the reclined position B causes the seat shell member 444 to move from a first position C to a rearward and reclined position D. Specifically, the link member 468 draws the seat shell member 444 rearwardly with the second portion 428 of the rear shell member 422 as the second portion 428 of the rear shell member 422 is moved from the upright position A to the reclined portion B. As noted above, the front support member 474 is slightly longer than the rear support member 476, thereby causing the forward portion 448 of the seat shell member 444 to vertically raise at a rate slightly faster than the rearward portion 450 of the seat shell member 440 as the seat shell member 444 is moved from the first position C to the reclined position D. It is also noted that the upper portion 438 of the rear shell member 422 and the upper portion 458 of the back support member 446 tend to recline about a pivot point located forwardly of the gap 442 at a slightly greater rate than the rate of recline of the mid-portion 440 of the rear shell member 422 and the mid-portion 460 of the back support member 446 as the rear shell member 422 and the back support member 446 are moved between the upright position A and the reclined position B.

As best illustrated in FIG. 18, the mid-portion 460 of the back support member 446 may be compressed or moved separately from movement of the seat shell member 444. As noted above, a lowermost end of the lower portion 456 of the back support member 446 extends through the aperture or slot 470 of the link member 468. This configuration effectively decouples certain movements of the back support member 446 from movements of the seat shell member 444. For example, a force F may be exerted to the mid-portion 460 of the back support member 446 thereby flexing the back support member 446 rearwardly. In this instance, the position of the seat shell member 444 remains relatively constant as the back support member 446 is allowed to move within the aperture or slot 470.

In yet another embodiment, a seating arrangement 400 g (FIGS. 20 and 21) includes a lowermost end of the lower portion 456 g of the back support member 446 g extending through the slot 470 g of the link member 468 g and attached to a forward surface 482 of the rear shell member 422 g. Similar to the embodiment as described above, this arrangement effectively decouples movement or compression of the mid-portion 460 g of the back support member 446 g from movement of the seat shell member 444 g, such that the back support member 446 g can be compressed without moving the seat shell member 444 g.

The reference numeral 500 (FIG. 22) generally designates another embodiment of a seating arrangement. In the illustrated example, the seating arrangement or chair assembly 500 includes a cantered base assembly 502 abutting a floor surface 504, a seat arrangement 506 and a back arrangement 508 each supported above the base assembly 502, and a pair of arm assemblies 510. In the illustrated example, the chair assembly 500 (FIG. 23) includes a rear or second shell member 512 and a front or first shell member 514. The shell members 512, 514 may be formed as a single, integral piece or comprise multiple, individual components. The shell members 512, 514 each comprise one or more flexibly resilient polymer materials such as any thermal plastic, including, for example, nylon, glass-filled nylon, polypropylene, acetyl, or polycarbonate; any thermal set material, including, for example, epoxies; or any resin-based composites, including, for example, carbon fiber or fiberglass, thereby allowing each of the shell members 512, 514 to conform and move in response to forces exerted by a user. Although a polymer material may be preferred, other suitable materials may also be utilized, such as metals, including, for example, steel or titanium; plywood; or a composite material including plastics, resin-based composites, metals and/or plywood. A variety of other suitable energy-storing materials may also be utilized.

The second shell member 512 includes a horizontally-extending bottom or first portion 516, a vertically-extending upper or second portion 518 extending upwardly from the first portion 516, and an arcuately-shaped transition portion 520 extending between the first portion 516 and the second portion 518. In the illustrated example, the first portion 516 is supported by a column 522 of the pedestal assembly 502.

The first portion 516 of the second shell member 512 includes a bottom wall 524 having a forward portion 526 and a rearward portion 528, a pair of sidewalls 530 extending angularly upward and laterally from the bottom wall 524, and a front wall 532 extending angularly upward and forwardly from the bottom wall 524. The upper or second portion 518 of the second shell member 512 includes a lower portion 534, an upper portion 536 and a mid-portion 538 located therebetween.

The rear or second shell member 512 further includes a U-shaped aperture 540 that includes a laterally-extending base portion 542 and a pair of forwardly-extending arm portions 544. In the illustrated example, the base portion 542 of the aperture 540 is positioned proximate the rearward portion 528 of the bottom wall 524 of the first portion 516 and proximate the transition portion 540, while the arm portions 544 extend forwardly from the base portion 542 and are located proximate the bottom wall 524 and proximate the sidewalls 530. The arm portions 544 angle or flair outwardly from one another from the base portion 542 to a distal end 546 of each of the arm portions 544. The second shell member 512 further includes an aperture 548 that extends from the transition portion 520 into the lower portion 534 of the second portion 518.

The front shell member 514 includes a horizontally-extending bottom or first portion 550, a vertically-extending upper or second portion 552 extending upwardly from the first portion 550, and an arcuately-shaped transition portion 554 extending between the first portion 550 and the second portion 552. The first portion 550 includes a forward portion 556 and a rearward portion 558, while the second portion 552 includes a lower portion 560, an upper portion 562, and an arcuately-shaped, forwardly convex mid-portion 564 located therebetween and configured to support the lower area of a user's back. The upper portion 562 of the second portion 552 of the first shell member 514 is connected to the upper portion 536 of the second portion 518 of the second shell member 512 at a location 566, such as by sonic welding, an adhesive, integral molding, mechanical fasteners, and the like. The second shell member 512 and the first shell member 514 are configured so as to define a gap 568 between at least a portion of the upper portion 562 and the upper portion 536, between the mid-portion 564 and the mid-portion 538, between the lower portion 560 and the lower portion 534, between the transition portion 554 and the transition portion 520, and between the second portion 552 and the second portion 518.

In operation, the second portion 518 (FIG. 25) of the second shell member 512 and the second portion 552 of the first shell member 214 are movable or reclinable from an upright position A to a reclined position B. The configuration of the U-shaped aperture 540 allows the first shell member 212 to deflect as the second shell member 212 is moved from the upright position A to the reclined position B. In the illustrated example, a portion 570 of the second shell member 512 located immediately rearwardly of the aperture adjacent to the base portion 542 of the aperture 540 travels downwardly as the second portion 518 of the second shell member 512 moves from the upright position A to the reclined position B. It is further noted that the location and configuration of the aperture 548 within the transition portion 520 and the second portion 518 of the second shell member 512 allows portions of the second shell member 512 located laterally outward of the aperture 548 to more easily flex as the second portion 218 of the second shell member 512 is moved from the upright position A to the reclined position B.

The reference numeral 500 h (FIG. 26) generally designates another embodiment of a seating arrangement. Since the chair assembly 500 h is similar to the previously described chair assembly 500, similar parts appearing in FIGS. 22-25 and FIG. 26 respectively are represented by the same, corresponding reference numeral, except for the suffix “h” in the numerals of the latter. In the illustrated example, the chair assembly 500 h is similar to the chair assembly 500 with the most notable exception being the replacement of the aperture 548 of the chair assembly 500 with a plurality of apertures 574. The plurality of apertures 574 includes a pair of arcuately-shaped apertures 576 that extend both vertically and laterally from a first end 578 located within the lower portion 534 h of the second portion 518 h of the second shell member 512 h, and a second end 580 located within the transition portion 520 h of the second shell member 512 h. As illustrated, the apertures 574 sweep downwardly and outwardly from the first ends 578 to the second ends 580. An upwardly-concave, arcuately-shaped second aperture 582 extends laterally across the transition portion 520 h and includes a first end 584 and a second end 586 respectively located proximate the second ends 580 of the corresponding apertures 576. The second aperture 582 also includes a center portion 588 extending vertically upward from the arcuate portion of the second aperture 582 and along a centroidal axis of the first shell member 212 h. The plurality of apertures 574 cooperate to define a pair of downwardly-extending tabs 590. The plurality of apertures 574 serve to increase the flexibility of the lower portion 534 h of the second portion 518 h of the second shell member 514 h and the transition portion 520 h as the second shell member 512 h is moved between an upright and reclined position, similar to the upright position A and the reclined position B illustrated in FIG. 25.

The reference numeral 500 i (FIG. 27) generally designates another embodiment of a seating arrangement 500. Since the chair assembly 500 i is similar to the previously described chair assembly 500, similar parts appearing in FIGS. 22-24 and FIG. 27 respectively are represented by the same, corresponding reference numeral, except for the suffix “i” in the numerals of the latter. The chair assembly 500 i is similar to the chair assembly 500 with the most notable exception being the inclusion of an upper aperture 592 and a structural reinforcement and biasing assembly 594. In the illustrated example, the upper aperture 592 extends across and comprises the majority of the upper portion 536 i of the second portion 518 i of the second shell member 512 i and extends downwardly into the mid-portion 538 i of the second portion 518 i of the second shell member 512 i. The structural reinforcement and biasing assembly 592 includes a flexibly resilient rod 596 extending vertically between the upper portion 536 i and a mounting plate 598. In the illustrated example, an upper end 600 of the rod 596 is attached to the upper portion 536 i of the second portion 518 i of the second shell member 512 i by a mechanical fastener 602, while a second end 604 of the rod 596 is attached to the mounting plate 598 positioned either above or below the bottom wall 524 i of the first portion 516 i of the second shell member 512 i. The rod 596 may also be attached along the length thereof to the mid-portion 538 i of the second portion 518 i of the second shell member 512 i by a mechanical fastener 606. In operation, the rod 596 serves to structurally reinforce the second portion 518 i of the second shell member 512 i as well as to bias the second portion 518 i of the second shell member 512 i from a reclined position to an upright position, similar to the reclined position B and upright position A illustrated in FIG. 25.

The reference numeral 500 j (FIG. 28) generally designates yet another embodiment of a seating arrangement 500. Since the chair assembly 500 j is similar to the previously described chair assembly 500, similar parts appearing in FIGS. 22-24 and FIG. 28 respectively are represented by the same, corresponding reference numeral, except for the suffix “j” in the numerals of the latter. The chair assembly 500 j is similar to the chair assembly 500 with the most notable exception being the inclusion of a structural reinforcement and biasing assembly 608. The structural reinforcement and biasing assembly 608 includes a pair of generally L-shaped, flexibly resilient biasing members 610 each having a generally horizontally-extending first portion 612 and generally vertically-extending second portion 614. Each first portion 612 includes a downwardly-turned distal end 616 welded to an attachment plate 618 that is secured to a support plate 620 that is in turn secured to the first portion 516 j of the second shell member 512 j by a plurality of mechanical fasteners such as bolts 622. A distal end 624 of the second portion 614 of each of the biasing members 610 is attached to the mid-portion 538 j of the second portion 518 j of the second shell member 512 j by a plurality of mechanical fasteners such as bolts 626. In operation, the biasing members 610 serve to structurally reinforce the second portion 518 j of the second shell member 512 j as well as to bias the second portion 518 j of the second shell member 512 j from a reclined position and to an upright position, similar to the reclined position B and the upright position A illustrated in FIG. 25.

The structural reinforcement and biasing assembly 608 further includes a tilt limiting arrangement 630 (FIG. 29) that limits the rearward recline range of the second portion 518 j of the second shell member 512 j. Each biasing member 610 further includes an arcuately-shaped transition portion 632 positioned between the first portion 612 and the second portion 614. Each transition portion 632 includes an arcuately-shaped, downwardly and forwardly extending abutment or stop member 634. In operation, the ends of the stop members 634 are spaced from a stop plate 636, attached to the support plate 620, when the second portion 518 j of the second shell member 512 j is in the upright position. During recline, the ends of the stop members 634 contact or abut the stop plate 636 thereby limiting the rearward recline of the second portion 518 j of the second shell member 512 j.

The reference numeral 700 (FIG. 30) generally designates another embodiment of a seating arrangement. In the illustrated example, the seating arrangement or chair assembly 700 includes a cantered base assembly 702 abutting a floor surface 704, a seat assembly 706 and a back assembly 708 each supported above the base assembly 702, and a pair of arm assemblies 710. In the illustrated example, the chair assembly 700 (FIG. 31) includes a front or a first shell member 714 and a rear or second shell member 712. The shell members 712, 714 may be formed as a single, integral piece or comprise multiple, individual components. In the illustrated example, the first shell member 712 includes a single, integral piece, while the second shell member 714 includes a two-piece construction as described below. The shell members 712, 714 each comprise a flexibly resilient polymer material such as any thermal plastic, including, for example, nylon, glass-filled nylon, polypropylene, acetyl, or polycarbonate; any thermal set material, including, for example, epoxies; or any resin-based composites, including, for example, carbon fiber or fiberglass, thereby allowing each of the shell members 712, 714 to conform and move in response to forces exerted by a user. Although a polymer material is preferred, other suitable materials may also be utilized, such as metals, including, for example, steel or titanium; plywood; or a composite material including plastics, resin-based composites, metals and/or plywood. A variety of other suitable energy-storing materials may also be utilized.

The rear shell member 712 includes a horizontally-extending bottom or first portion 716, a vertically-extending upper or second portion 718 extending upwardly from the first portion 716, and an arcuately-shaped transition portion 720 extending between the first portion 716 and the second portion 718. In the illustrated example, the rear shell member 712 comprises a two-part construction having a first portion 722 and a second portion 724 each having one portion of a lap joint 726. Specifically, the lap joint 726 includes a first portion 728 integral with the first portion 722 of the rear shell member 712 and a second portion 730 integral with the second portion 724 of the rear shell member 712, where the first portion 722 and the second portion 724 each cantilever and overlap with one another to form the lap joint 726. In assembly, a column 732 (FIGS. 31 and 34) of the pedestal assembly 702 is received through an aperture 734 of the first portion 722 and an aperture 736 of the second portion, and the first portion 728 and the second portion 730 of the lap joint 726 are held in connection by a lower coupler 738 and an upper coupler 740 as described below. It is noted that while the embodiment illustrated in FIG. 32 shows a two-piece rear shell member 712, alternate embodiments may include more than two pieces, or an integral, single-piece construction.

The front shell member 714 (FIGS. 31 and 35) includes a horizontally-extending bottom or first portion 744, a vertically-extending upper or second portion 746 extending upwardly from the first portion 744, and an arcuately-shaped transition portion 748 extending between the first portion 744 and the second portion 746. The first portion 744 includes a forward portion 750 and a rearward portion 752, while the second portion 746 includes a lower portion 754, an upper portion 756 and an arcuately-shaped, forwardly convex mid-portion 758 located therebetween and configured to support the lumbar region of a user's back. An intermediate portion 759 of the second portion 746 of the front shell member 714 located between the upper portion 756 and the mid-portion 758 is connected to an upper portion 761 of the second portion 718 of the rear shell member 712, such as by sonic welding, an adhesive, integral molding, mechanical fasteners, and the like. The rear shell member 712 and the front shell member 714 are configured so as to define a gap 762 therebetween.

The front shell member 714 further includes a pair of laterally-spaced slots 764 extending in a fore-to-aft direction from a mid-portion of the second portion 746 to the intermediate portion 759 of the second portion 746, with the fore end of each slot 764 ending in an aperture 766, thereby dividing the front shell member 714 into an inner portion 768 and outer portion 770. The division of the inner portion 768 from the outer portions 770 allows the inner portion 768 to flex separately from the outer portions 770 during recline of the back assembly 708 from an upright position A to a recline position B. As best illustrated in the FIGS. 36Aa and 36B, the flexing of the front shell member 714 during recline is such that the inner portion 768 flexes less than the outer portion 770 such that the outer portion 770 descends relative to the inner portion 768, thereby allowing additional flexibility in the front shell member 714 while providing adequate support for the seated user via the inner portion 768. The differentiation of flexure of the inner portion 768 and the outer portions 770 causes the second portion 746 of the front shell member 714 to move from the reclined position toward the upright position and exert an increased pressure to the back of a seated user as the force exerted on the inner portion 768 is increased, such as the force exerted by the weight of a seated user.

The front shell member 714 (FIGS. 35 and 37) further includes a pair of C-shaped reliefs or apertures 772 each defining a tab 774. Each tab 744 has a laterally-extending flexing region 776 of relative reduce thickness thereby promoting flexure of each tab 744 in this region as described below.

The chair assembly 700 (FIGS. 30 and 31) further includes a pair of laterally-extending support members or linkage members, including a forward support or linkage member 778 and a rearward support or linkage member 780, each extending between the second portion 746 of the forward shell member 714 and the second portion 716 of the rear shell member 712. In the illustrated example, the forward support member 778 is flexibly resilient along the length thereof, while the rearward support member 780 is relatively rigid. The forward support member 778 is integrally formed within the back shell member 716 and rigidly attached to the front shell member 714, while the rearward support member 780 is rigidly attached to the rear shell member 716, however, the forward support member 778 and the rearward support member 780 may be formed as separate pieces, or as integral portions of the rear shell member 712 and/or the front shell member 714. Further, in the illustrated example, the inner portion 768 cooperates with the forward support member 778 and the rearward support member 780 to form a control mechanism that synchronizes the rearward movement of the first portion 744 of the front shell member 714 with reclining movement of the second portion 746 of the front shell member 714 as further described below.

In the present example, the first portion 716 (FIGS. 34, 37) of the rear shell member 712 includes a laterally-extending flexing region 782 of relative reduced thickness located fore of the attachment location of the rearward support member 780 with the rear shell member 712. The forward support member 778 includes a laterally-extending flexing region 784 of relative reduced thickness located at a lower end of the forward support member 778 such that flexure of the forward support member 778 is concentrated in the flexing region 782 while the remainder of the forward support member may be relatively rigid and may remain relatively straight. The forward support member 778 connects to each of the tabs 774 aft of the flexing region 776. Referring to FIGS. 36A and 36B, it is noted that the rearward support member 780 remains rigid during recline, while the second portion 746, the second portion 716 and the forward support member 778 flex, with the flexing regions or flexing zones 776, 782, 784 flexing a greater amount than the remainder of each of the associated components. As previously noted, the various thicknesses of the linkages or members comprising the overall supporting four-bar linkage may be varied so as to provide specific support and bending characteristics previously described. It is further noted that this configuration provides adequate flexure to the front shell member 714 while allowing an outer perimeter edge 785 of the front shell member to remain continuous and without breaks or reliefs, thereby providing a continuous edge aesthetic edge, while simultaneously reducing or eliminating wear of a supported cover assembly 787 (FIGS. 30 and 34) typically caused by repeated flexing of a supporting chair surface. In the illustrated example, the cover assembly 787 includes a flexible resilient substrate layer 791 supported by the front shell member 714 and comprising a thermal plastic, a foam layer 793 molded to the substrate layer 791, and a fabric cover 795 thermally set to the foam layer 793. Alternatively, the fabric cover may be wrapped about the foam layer 793 and secured to an underside of the substrate layer 791 by separate mechanical fasteners such as staples (not shown) or to integral fasteners (not shown) integrally molded with the substrate layer 791, and/or secured about the foam layer 793 and the substrate layer 791 by a drawstring arrangement (not shown). In the illustrated example, the foam layer 793 and the fabric cover 795 are both continuous and free from irregularities along the edges thereof, such as apertures, reliefs, cut-outs, stitching, pleats, and the like. In an alternative embodiment, the continuous outer perimeter edge 785 of the front shell member 714 may provide an uninterrupted edge about which to wrap the fabric cover 795. In another alternative arrangement, a separate outermost shell (not shown) comprising a molded thermal plastic may replace the cover assembly 787 and provide an outer, user supporting surface eliminating the need for a fabric-type cover.

The chair assembly 700 further includes a recline stop arrangement 790 (FIG. 34). In the illustrated example, the stop arrangement 790 includes a stop member 792 (FIG. 38) having a cylindrical body portion 794 that receives an upper end of the column 732 therein, a flange 796 that extends about the body portion 794 and that cooperates with the lower coupler 738 to couple the first portion 722 and the second portion 724 of the rear shell member 712 together such that the stop member 792 functions as the upper coupler 740 as previously described, and a stop arm 798 extending rearwardly from the body portion 794. The stop arm 798 extends through an aperture 802 in a front wall 804 of the rearward support member 780 such that a pair of stops 800 located at a distal end of the stop arm 798 are located within an interior space or cavity 806 of the rearward support member 780 defined between the front wall 804 and a rear wall 808. Alternatively, the aperture 802 and the interior space may be lined with a plastic bushing member 809. The stop arm 798 and stops 800 cooperate to form a control rod. In operation, the rearward recline of the back assembly 708 from the upright position A toward the recline position B is limited by the stops 800 abutting the rear wall 808, while a forward tilting of the chair back 708 from the reclined position B toward the upright position A is limited by the stops 800 abutting the front wall 804. It is noted that the present configuration provides a relatively open chair structure such that the components comprising the four-bar linkage, the arm support structure and portions of the recline limiting arrangement are viewable, while the abutting stop components are concealed from view and within the existing supporting structures and specifically a component of the four-bar linkage. As best illustrated in FIGS. 30 and 39, the arm support members 820 are integral with and supported by a cover portion 822 configured to aesthetically cover the stop arrangement 792. The arm support members 820 and cover portion 822 may be removed from the chair assembly 700 and alternatively replaced with a cover member 824, thereby providing an armless embodiment of the chair assembly on the same underlying platform.

Alternatively, the arm assemblies 710, the arm support members 820 and the cover portion 822 may be replaced by an accessory supporting arrangement 830 (FIG. 40) that includes a support portion 832 configured as a housing to aesthetically cover the stop arrangement 792, and a chair accessory such as an arm assembly 834, or a leg assembly 836 configured to support the chair assembly 700 above a floor surfaces in place of the support assembly 702. While an arm assembly 834 and a leg assembly 936 are provided as examples, other chair accessories are also contemplated, such as tablet supports, work surfaces, beverage holders, and the like. In the illustrated example, the support portion 832 includes the first portion 838 of a releasable coupling arrangement, while the accessory includes the second portion 840 of the coupling arrangement, thereby allowing multiple accessories to be interchangeably supported from the same underlying support structure.

The reference numeral 900 (FIG. 41) generally designates another embodiment of a seating arrangement. In the illustrated example, the seating arrangement or chair assembly 900 is similar to the chair assembly 700 previously described with the most notable exceptions being the inclusion of a first structural reinforcement member 902, a second structural reinforcement member 904, and the construction of the front shell member 914 via a multi-layer over-molding process. In the illustrated example, the chair assembly 900 includes the front or first shell member 914, and a rear or second shell member 912, where the front shell 914 is covered by a substrate layer 905 and a fabric cover assembly 907.

The rear shell member 912 is similar to the rear shell member 714 of the chair assembly 700 and includes a horizontally-extending bottom or first portion 916 (FIG. 42), a vertically-extending upper or second portion 918 extending upwardly from the first portion 916, and an arcuately-shaped transition portion 920 extending between the first portion 916 and the second portion 918. In the illustrated example, the rear shell member 912 comprises an integral, single-piece construction. In assembly, a pneumatic height adjustable column 932 is received through an aperture 934 of the rear shell member 912.

The front shell member 914 (FIGS. 41 and 42) includes an outer shell member 922 having a horizontally-extending bottom or first portion 944, a vertically-extending upper or second portion 946 extending upwardly from the first portion 944, and an arcuately-shaped transition portion 948 extending between the first portion 944 and the second portion 946. The first portion 944 includes a forward portion 950 and a rearward portion 952, while the second portion 946 includes a lower portion 954, an upper portion 956 and an arcuately-shaped, forwardly convex mid-portion 958 located therebetween and configured to support the lumbar region of a user's back. The front shell member 914 further includes a pair of laterally-spaced slots 964 extending in a fore-to-aft direction similar to the slots 764 of the chair assembly 700 as previously described.

The front shell member 914 further includes an inner shell portion 924 having a horizontally-extending bottom or first portion 960, a vertically-extending upper or second portion 962, and an arcuately-shaped transition portion 964 extending between the first portion 960 and the second portion 962. In assembly, the inner shell portion 924 is over-molded over the outer shell member 922 such that the inner shell portion 924 covers or overlaps with at least a portion of the bottom portion 944, the upper portion 946 and transition portion 946. The inner shell portion 924 is preferably positioned with respect to the outer shell member 922 such that the inner shell portion 924 covers the apertures 964 of the outer shell member 922. Preferably, the inner shell portion 924 comprises a material that is more flexible than the material from which the outer shell member 922 is constructed, more preferably the inner shell portion 924 and outer shell member 922 each comprise a thermoplastic polymer, and most preferably, the outer shell member 922 comprises polyethylene terephthalate or polybutylene terephthalate, and the inner shell portion 924 comprises a thermoplastic polyolefin.

The chair assembly 900 further includes the structural reinforcement member 902 located in the transition portion 948 of the front shell member 914. In the illustrated example, the structural reinforcement member 902 is arcuately-shaped to match the arcuate shape of the transition portion 948. The reinforcement member 902 comprises a relatively stiff material, such as metal, and extends through the transition portion 948, such that the reinforcement member 902 prevents the angle between the bottom portion 944 and the upper portion 946 from increasing as the upper portion 946 is moved from the upright portion to the reclined position, thereby concentrating compliance or bending in the control arrangement forward of the transition portion 948.

The chair assembly 900 further includes the structural reinforcement member 904 extending between the tabs 972 that are similar to the tabs 772 of the chair assembly 700. The reinforcement member 904 overlaps with an area of the bottom portion 944 of the shell member 914 so as to disperse forces transmitted between the rear shell 912 and the front shell 914 in the vicinity of the tabs 972.

It is noted that in each of the aforedescribed embodiments, the seating arrangement is configured such that some, many, or all of the components may be visible from an exterior of the seating arrangements subsequent to the seating arrangements being completely manufactured and assembled, such that the visible components form an outer aesthetic appearance of the seating arrangement, or alternatively may be enclosed within an interior of the chair assembly such that the components are not visible to the casual observer. Specifically, components such as the forward support member, the rearward support member, the support member, as well as the stop arrangements as described are at least partially visible from an exterior of the chair, and cooperate to form an overall outer aesthetic thereof. Certain embodiments may include some, many, or all of the components described herein. For example, an embodiment may include one or more apertures, one or more of the stop systems, and/or components or materials selected for performance purposes, e.g., to bias the seat arrangement to an upright position or for material strength requirements. In some embodiments, a selection of a particular component may influence the selection of various other components. For example, using a particular aperture or apertures may dictate what type of components or materials should be used for performance purposes and vice versa.

Various embodiments of the seating arrangements described herein may provide a platform with the proper fit and function for comfortably supporting a seated user that may also reduce or shift costs, for example by reducing associated part counts, manufacturing costs, and labor costs. Certain aspects of the seating arrangements may include an uncomplicated, durable, and visually appealing design capable of a long operating life, and particularly well adapted for the proposed use.

-   1. A seating arrangement, comprising:

an upwardly extending back arrangement movable between an upright position and a reclined position; and

a seat arrangement, comprising:

-   -   a first link member extending substantially horizontally, the         first link member having a forward portion and a rearward         portion and configured to support a seated user thereon;     -   a second link member spaced from the first link member;     -   a third link member operably coupled to the forward portion of         the first link member and to the second link member, the third         link member being substantially flexible along a majority of a         length thereof; and     -   a fourth link member operably coupled to the rearward portion of         the first link member and to the second link member, the fourth         link member being substantially rigid along a majority of a         length thereof; and

wherein the first link member, the second link member, the third link member and the fourth link member cooperate to form a linkage arrangement, and wherein the seat arrangement moves in a rearward direction as the back arrangement is moved between the upright position and the reclined position.

-   2. The seating arrangement of claim 1, further comprising:

an integral, single-piece first shell member that includes a first portion of the back arrangement and the first link member of the seat arrangement.

-   3. The seating arrangement of claim 2, further comprising:

an integral, single-piece second shell member that includes a second portion of the back arrangement and the second link member of the seat arrangement.

-   4. The seating arrangement of claim 3, wherein the first shell     member includes an arcuately-shaped first transition region located     between the first portion of the back arrangement and the first link     member. -   5. The seating arrangement of claim 4, wherein the second shell     member includes an arcuately-shaped second transition region located     between the second portion of the back arrangement and the second     link member. -   6. The seating arrangement of claim 5, wherein the third link member     and the second shell member are an integral, single-piece. -   7. The seating arrangement of claim 6, wherein the first shell     member comprises a poly material. -   8. The seating arrangement of claim 7, wherein the second shell     member comprises carbon fiber. -   9. The seating arrangement of claim 8, wherein the fourth link     comprises carbon fiber. -   10. The seating arrangement of claim 6, wherein the first link     includes a forward portion, a rearward portion, and at least one     laterally-extending relief located between the forward portion and     the rearward portion, such that the rear portion of first link     rotates at a different rate than the forward portion of the first     link as the back arrangement is moved from the upright position to     the reclined position. -   11. The seating arrangement of claim 10, wherein the rear portion of     the first link rotates at a greater rate of rotation than the second     portion of the first link as the back arrangement is moved between     the upright position and the reclined position. -   12. The seating arrangement of claim 11, wherein the linkage     arrangement comprises a four-bar arrangement. -   13. The seating arrangement of claim 1, further comprising:

an integral, single-piece first shell member that includes a first portion of the back arrangement, the first link member of the seat arrangement and an arcuately-shaped transition region located between the first portion of the back arrangement and the first link of the seat arrangement.

-   14. The seating arrangement of claim 1, further comprising:

an integral, single-piece second shell member that includes a second portion of the back arrangement, the second link member of the seat arrangement and an arcuately-shaped transition region located between the second portion of the back arrangement and the second link member.

-   15. The seating arrangement of claim 1, further comprising:

an integral, single-piece second shell member that includes a second portion of the back arrangement, the second link member of the seat arrangement, the third link member, and an arcuately-shaped transition region located between the second portion of the back arrangement and the second link member.

-   16. The seating arrangement of claim 1, wherein the fourth link     member includes at least a portion of the back arrangement. -   17. The seating arrangement of claim 1, wherein the second link     member and the third link member are an integral, single-piece. -   18. The seating arrangement of claim 1, wherein the first link     member comprises a poly material. -   19. The seating arrangement of claim 1, wherein the second link     member comprises carbon fiber. -   20. The seating arrangement of claim 1, wherein the fourth link     comprises carbon fiber. -   21. The seating arrangement of claim 1, wherein the first link     includes a forward portion, a rearward portion, and at least one     laterally-extending relief located between the forward portion and     the rearward portion, such that the rear portion of first link     rotates at a different rate than the forward portion of the first     link as the back arrangement is moved from the upright position to     the reclined position. -   22. The seating arrangement of claim 21, wherein the rear portion of     the first link rotates at a greater rate of rotation than the second     portion of the first link as the back arrangement is moved between     the upright position and the reclined position. -   23. The seating arrangement of claim 1, wherein the seating     arrangement comprises an office chair assembly. -   24. The seating arrangement of claim 1, wherein the linkage     arrangement comprises a four-bar arrangement. -   25. A seating arrangement, comprising:

a first shell member having a substantially horizontally-extending first portion and a second portion extending substantially upwardly from the first portion, the first portion including a forward portion, a rearward portion and a central portion located between the forward portion and the rearward portion, the second portion movable between an upright position and reclined position;

a second shell member having a substantially horizontally-extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending substantially upwardly from the first portion of the second shell member, the first portion of the second shell member including a forward portion and a rearward portion, the second portion of the second shell member movable between the upright position and the reclined position;

a first link member extending between and operably coupled to the first portion of the of the first shell member and the first portion of the second shell member; and a second link member extending between the first portion of the first shell member and the first portion of the second shell member, the second link member being located rearwardly of the first link member;

wherein the first portion of the first shell member, the first portion of the second shell member, the first link member and the second link member cooperate to form a linkage arrangement; and

wherein the central portion of the first portion of the first shell member flexes a greater amount than the rearward portion of the first portion of the first shell member, the rearward portion of the second shell member flexes a greater amount than the forward portion of the second shell member, the first link member flexes along a majority of a length of the first link member and the second link member remains substantially rigid along a majority of a length of the second link member as the second portion of the first shell member and the second portion of the second shell member are moved from the upright position to the reclined position.

-   26. The seating arrangement of claim 25, wherein rearward portion of     the first portion of the second shell member is located at least     partially forward of a location that the second link member is     coupled to the first portion of the second shell member. -   27. The seating arrangement of claim 26, wherein the central portion     of the first portion of the first shell member includes at least one     laterally-extending relief, thereby allowing the rearward portion of     first portion to rotate at a different rate than the forward portion     of the first portion as a back arrangement comprising the second     portion of the first shell and the second portion of the second     shell is moved from the upright position to the reclined position. -   28. The seating arrangement of claim 27, wherein the rearward     portion of the first portion of the second shell member rotates at a     greater rate of rotation than the forward portion of the first     portion of the second shell member as the second portion of the     second shell member is moved between the upright position and the     reclined position. -   29. The seating arrangement of claim 26, wherein the first shell     member is an integral, single-piece. -   30. The seating arrangement of claim 29, wherein the first shell     member includes an arcuately-shaped transition region located     between the first portion of the first shell member and the second     portion of the first shell member. -   31. The seating arrangement of claim 29, wherein the second shell     member is an integral, single-piece. -   32. The seating arrangement of claim 31, wherein the second shell     member includes an arcuately-shaped transition region located     between the first portion of the second shell member and the second     portion of the second shell member. -   33. The seating arrangement of claim 31, wherein the first shell     member comprises a poly material. -   34. The seating arrangement of claim 31, wherein the second shell     member comprises carbon fiber. -   35. The seating arrangement of claim 31, wherein the first link     member and the first portion of the second shell member are an     integral, single-piece. -   36. The seating arrangement of claim 35, wherein the second link     member comprises a carbon fiber. -   37. The seating arrangement of claim 25, wherein the linkage     arrangement comprises a four-bar linkage arrangement. -   38. The seating arrangement of claim 25, wherein the central portion     of the first portion of the first shell member includes at least one     laterally-extending relief, such that the rearward portion of first     portion rotates at a different rate than the forward portion of the     first portion as a back arrangement comprising the second portion of     the first shell and the second portion of the second shell is moved     from the upright position to the reclined position. -   39. The seating arrangement of claim 38, wherein the rearward     portion of the first portion of the second shell member rotates at a     greater rate of rotation than the forward portion of the first     portion of the second shell member as the second portion of the     second shell member is moved between the upright position and the     reclined position. -   40. The seating arrangement of claim 25, wherein the first shell     member is an integral, single-piece. -   41. The seating arrangement of claim 40, wherein the first shell     member includes an arcuately-shaped transition region located     between the first portion of the first shell member and the second     portion of the first shell member. -   42. The seating arrangement of claim 25, wherein the second shell     member is an integral, single-piece. -   43. The seating arrangement of claim 42, wherein the second shell     member includes an arcuately-shaped transition region located     between the first portion of the second shell member and the second     portion of the second shell member. -   44. The seating arrangement of claim 25, wherein the first shell     member comprises a poly material. -   45. The seating arrangement of claim 25, wherein the second shell     member comprises carbon fiber. -   46. The seating arrangement of claim 25, wherein the first link     member and the first portion of the second shell member are an     integral, single-piece. -   47. The seating arrangement of claim 46, wherein the first link     member comprises carbon fiber. -   48. The seating arrangement of claim 25, wherein the seating     arrangement comprises an office chair assembly. -   49. The seating arrangement of claim 25, wherein the seat assembly     is configured such that the first link member provides an outer     aesthetic appearance of the seating arrangement. -   50. The seating arrangement of claim 49, wherein the seat assembly     is configured such that the second link member provides an outer     aesthetic appearance of the seating arrangement. -   51. The seating arrangement of claim 50, wherein the seat assembly     is configured such that the first portion of the first shell member     provides an outer aesthetic appearance of the seating arrangement. -   52. The seating arrangement of claim 51, wherein the seat assembly     is configured such that the first portion of the second shell member     provides an outer aesthetic appearance of the seating arrangement. -   53. The seating arrangement of claim 25, wherein the seating     arrangement comprises an office chair assembly. -   54. A seating arrangement, comprising:

a seat arrangement, comprising:

-   -   a substantially horizontally-extending first link member         configured to support a seated user thereon, the first link         member having a first end and second end;     -   a second link member at least partially spaced from the first         link member, the second link member having a first end and a         second end;     -   a third link member operably coupled to the first end of the         first link member and the first end of the second link member;     -   a fourth link member operably coupled to the second end of the         first link member and the second end of the second link member,         such that the first link member, the second link member, the         third link member and the fourth link member cooperate to form a         linkage arrangement having an interior space;

a back arrangement extending substantially upward from the first link member and movable between an upright position and a reclined position;

a support member positioned at least partially within the interior space of the linkage arrangement, the support member configured to remain substantially stationary with respect to a ground surface as the back arrangement is moved between the upright position and the reclined position; and

an arm support assembly that includes an armrest surface configured to support an arm of a seated user, the arm support assembly coupled to and supported by the support member such that the armrest surface remains substantially stationary with respect to a ground surface as the back arrangement is moved between the upright position and the reclined position.

-   55. The seating arrangement of claim 54, wherein the arm support     assembly is located completely in front of the back arrangement when     the back arrangement is in the upright position. -   56. The seating arrangement of claim 55, wherein the support member     comprises a non-functional, aesthetic component. -   57. The seating arrangement of claim 56, wherein the support member     comprises an open loop-shape. -   58. The seating arrangement of claim 54, wherein the seat assembly     is configured such that the support member is at least partially     visible from an exterior of the seating arrangement. -   59. The seating arrangement of claim 54, wherein the fourth link     member extends through the support member. -   60. The seating arrangement of claim 59, wherein the third link     member includes a top end and a bottom end, and angles forwardly     from the bottom to the top thereof. -   61. The seating arrangement of claim 54, wherein the third link     member is fixedly secured to the first link member and the second     link member. -   62. The seating arrangement of claim 61, wherein the fourth link     member is fixedly secured to the first link member and the second     link member. -   63. The seating arrangement of claim 62, wherein the third link     member is flexible along a majority of a length thereof. -   64. The seating arrangement of claim 63, wherein the fourth link     member is substantially rigid along a majority of a length thereof. -   65. The seating arrangement of claim 64, wherein the third link     member is V-shaped. -   66. The seating arrangement of claim 54, wherein the seat assembly     is configured such that the support member is at least partially     visible from an exterior of the seating arrangement. -   67. The seating arrangement of claim 54, wherein the seat assembly     is configured such that the third link member is at least partially     visible from an exterior of the seating arrangement. -   68. The seating arrangement of claim 67, wherein the seat assembly     is configured such that the fourth link member is at least partially     visible from an exterior of the seating arrangement. -   69. The seating arrangement of claim 68, wherein the seat assembly     is configured such that the first link member is at least partially     visible from an exterior of the seating arrangement. -   70. The seating arrangement of claim 69, wherein the seat assembly     is configured such that the fourth link member is at least partially     visible from an exterior of the seating arrangement. -   71. The seating arrangement of claim 54, wherein the fourth link     member extends through the support member. -   72. The seating arrangement of claim 54, wherein the third link     member includes a top end and a bottom end, and the third link     member angles forwardly from the bottom to the top thereof. -   73. The seating arrangement of claim 54, further comprising:

a stop arrangement configured to limit a rearward movement of the back arrangement.

-   74. The seating arrangement of claim 73, wherein the stop     arrangement is configured to limit a forward movement of the back     arrangement. -   75. The seating arrangement of claim 74, wherein the stop     arrangement is positioned between the support member and the fourth     link member. -   76. The seating arrangement of claim 75, wherein the stop     arrangement comprises an elastically deformable bushing assembly. -   77. The seating arrangement of claim 54, wherein the fourth link     member includes at least a portion of the back arrangement. -   78. The seating arrangement of claim 54, wherein the seating     arrangement comprises an office chair assembly. -   79. The seating arrangement of claim 54, wherein the linkage     arrangement comprises a four-bar linkage arrangement. -   80. A seating arrangement, comprising:

a seat arrangement, comprising:

-   -   a substantially horizontally-extending first link member         configured to support a seated user thereon, the first link         member having a first end and second end;     -   a second link member at least partially spaced from the first         link member, the second link member having a first end and a         second end;     -   a third link member operably coupled to the first end of the         first link member and the first end of the second link member;     -   a fourth link member operably coupled to the second end of the         first link member and the second end of the second link member,         such that the first link member, the second link member, the         third link member and the fourth link member cooperate to form a         linkage arrangement;

a back arrangement extending substantially upward from the first link member and movable between an upright position and a reclined position, the back arrangement operably coupled to the seat arrangement such that the first link member moves between a forward position and a rearward position as the back arrangement is moved between the upright position and the reclined position; and

a stop arrangement including a stop link having a first end and a second end, the first end operably coupled to at least one of the first link member, the third link and the fourth link member such that the first end of the stop link moves with the at least one of the first link member, the third link member and the fourth link member as the back assembly moves between the upright position and the reclined position, wherein a travel of the second end is limited with respect to the second link member thereby limiting a rearward movement of the back arrangement toward the reclined position, and wherein the stop arrangement further includes an elastically deformable stop member that is configured to limit a forward movement of the back arrangement toward the upright position.

-   81. The seating arrangement of claim 80, wherein the elastically     deformable stop member includes a bushing member. -   82. The seating arrangement of claim 81, wherein the bushing member     includes an aperture that slidably receives the stop link therein. -   83. The seating arrangement of claim 82, wherein the first end of     the stop link is fixed with respect to the fourth link member. -   84. The seating arrangement of claim 83, further including:

a support member fixed with respect to the fourth link member and configured to remain substantially stationary with respect to a ground surface as the back assembly is moved between the upright position and the reclined position, wherein the second end of the stop link abuts the support member to limit the rearward movement of the back assembly toward the reclined position.

-   85. The seating arrangement of claim 84, wherein the bushing member     abuts the fourth link member and the support member to limit the     movement of the back assembly as the back assembly is moved from the     reclined position to the upright position. -   86. The seating arrangement of claim 85, further comprising:

an arm support assembly that includes an armrest surface configured to support an arm of a seated user, the arm support assembly coupled to and supported by the support member such that the armrest surface remains substantially stationary with respect to a ground surface as the back assembly is moved between the upright position and the reclined position.

-   87. The seating arrangement of claim 86, wherein the first link     member, the second link member, the third link member and the fourth     link member cooperate to form an interior space, and wherein the     support member is located at least partially within the interior     space. -   88. The seating arrangement of claim 80, wherein the third link     member is fixedly secured to the first link member and the second     link member. -   89. The seating arrangement of claim 88, wherein the fourth link     member is fixedly secured to the first link member and the second     link member. -   90. The seating arrangement of claim 89, wherein the third link     member is flexible along a majority of a length thereof. -   91. The seating arrangement of claim 90, wherein the fourth link     member is substantially rigid along a majority of a length thereof. -   92. The seating arrangement of claim 80, wherein the stop     arrangement is at least partially visible from an exterior of the     seat assembly. -   93. The seating arrangement of claim 80, wherein the third link     member includes a top end and a bottom end, and angles forwardly     from the bottom to the top thereof. -   94. The seating arrangement of claim 80, wherein the third link     member is V-shaped. -   95. The seating arrangement of claim 80, wherein the seat     arrangement is configured such that the support member is at least     partially visible from an exterior of the seating arrangement. -   96. The seating arrangement of claim 95, wherein the seat     arrangement is configured such that the third link member is at     least partially visible from an exterior of the seating arrangement. -   97. The seating arrangement of claim 96, wherein the seat     arrangement is configured such that the fourth link member is at     least partially visible from an exterior of the seating arrangement. -   98. The seating arrangement of claim 97, wherein the seat     arrangement is configured such that the first link member is at     least partially visible from an exterior of the seating arrangement. -   99. The seating arrangement of claim 98, wherein the seat     arrangement is configured such that the second link member is at     least partially visible from an exterior of the seating arrangement. -   100. The seating arrangement of claim 80, wherein the fourth link     member includes at least a portion of the back arrangement. -   101. The seating arrangement of claim 80, wherein the seating     arrangement comprises an office chair assembly. -   102. The seating arrangement of claim 80, wherein the linkage     arrangement comprises a four-bar linkage arrangement. -   103. A seating arrangement, comprising:

a seat arrangement, comprising:

-   -   a substantially horizontally-extending first link member         configured to support a seated user thereon, the first link         member having a first end and second end;     -   a second link member at least partially spaced from the first         link member, the second link member having a first end and a         second end;     -   a third link member operably coupled to the first end of the         first link member and the first end of the second link member;         and     -   a fourth link member operably coupled to the second end of the         first link member and the second end of the second link member,         such that the first link member, the second link member, the         third link member and the fourth link member cooperate to form a         linkage arrangement having an interior space;

a back arrangement extending substantially upward from the first link member and movable between an upright position and a reclined position, the back arrangement operably coupled to the seat assembly such that the first link member moves between a forward position and a rearward position as the back arrangement is moved between the upright position and the reclined position; and

a stop arrangement positioned at least partially within the interior space of the linkage arrangement and including a stop member, and a first stop surface and a second stop surface each fixed with respect to at least one of the first link member, the third link member and the fourth link member, wherein the stop member is configured to abut the first stop surface thereby limiting a rearward movement of the back arrangement as the back arrangement is moved from the upright position toward the reclined position, and wherein the stop member is configured to abut the second stop surface thereby limiting a forward movement of the back arrangement as the back arrangement is moved from the reclined position toward the upright position.

-   104. The seating arrangement of claim 103, wherein the first stop     surface and the second stop surface are each fixed with respect to     the first link member. -   105. The seating arrangement of claim 104, wherein the first stop     surface is substantially perpendicular to the first link member. -   106. The seating arrangement of claim 105, wherein the second stop     surface is substantially parallel with the first link member. -   107. The seating arrangement of claim 104, wherein at least one of     the first stop surface and the second stop surface is elastically     deformable. -   108. The seating arrangement of claim 103, wherein at least a     portion of the stop arrangement is at least partially visible from     an exterior of the seating arrangement. -   109. The seating arrangement of claim 103, wherein the third link     member is fixedly secured to the first link member and the second     link member. -   110. The seating arrangement of claim 109, wherein the fourth link     member is fixedly secured to the first link member and the second     link member. -   111. The seating arrangement of claim 109, wherein the third link     member is flexible along a majority of a length thereof. -   112. The seating arrangement of claim 111, wherein the fourth link     member is substantially rigid along a majority of a length thereof. -   113. The seating arrangement of claim 103, wherein the third link     member includes a top end and a bottom end, and angles forwardly     from the bottom to the top thereof. -   114. The seating arrangement of claim 103, wherein the third link     member is V-shaped. -   115. The seating arrangement of claim 103, wherein the seat     arrangement is configured such that the third link member provides     an outer aesthetic appearance of the seating arrangement. -   116. The seating arrangement of claim 115, wherein the seat     arrangement is configured such that the fourth link member provides     an outer aesthetic appearance of the seating arrangement. -   117. The seating arrangement of claim 116, wherein the seat     arrangement is configured such that the first link member is at     least partially visible from an exterior of the seating arrangement. -   118. The seating arrangement of claim 117, wherein the seat     arrangement is configured such that the second link member is at     least partially visible from an exterior of the seating arrangement. -   119. The seating arrangement of claim 103, wherein the fourth link     member includes at least a portion of the back arrangement. -   120. The seating arrangement of claim 103, wherein the seating     arrangement comprises an office chair assembly. -   121. The seating arrangement of claim 103, wherein the linkage     arrangement comprises a four-bar linkage arrangement. -   122. A seating arrangement, comprising:

a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion;

a flexibly resilient second shell member having a horizontally extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member; and

a pair of flexibly resilient support members extending between and supporting the second portion of the first shell member from the second portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member and the pair of support members cooperate to form a four-bar linkage arrangement such that the first portion of the second shell member is movable between a forward position and a rearward position; and

wherein the first portion of the second shell member is more flexible than the first portion of the first shell member, and wherein the pair of flexible support members are each more flexible than the first portion of the second shell member.

-   123. The seating arrangement of claim 122, wherein the at least one     of the support members comprises a substantially flat sheet. -   124. The seating arrangement of claim 123, wherein the pair of     support members comprise a single, integral piece. -   125. The seating arrangement of claim 124, wherein at least one of     the first shell member and the second shell member comprises a     polymer material. -   126. The seating arrangement of claim 125, wherein at least one of     the support members comprises a metal. -   127. The seating arrangement of claim 126, wherein one of the     support members of the pair of support members is longer than the     remaining support member of the pair of support members. -   128. The seating arrangement of claim 127, wherein the longer     support member is located forwardly of the remaining support member. -   129. The seating arrangement of claim 128, further comprising:

a first stop member configured to abut at least one of the pair of support members and limit movement of the first portion of the second shell member between the forward position and the rearward position.

-   130. The seating arrangement of claim 129, wherein the second     portion of the second shell member is movable between an upright and     a reclined position. -   131. The seating arrangement of claim 130, further comprising:

a second stop member configured to limit movement of the second portion of the second shell member between the upright and reclined positions.

-   132. The seating arrangement of claim 131, wherein the second stop     member includes a first portion attached to the first shell member     and a second portion attached to the second shell member. -   133. The seating arrangement of claim 132, wherein the first portion     of the second stop member includes a slot, and wherein the second     portion of the second stop member includes a tab slidably received     within the slot. -   134. The seating arrangement of claim 122, wherein the pair of     support members comprise a single, integral piece. -   135. The seating arrangement of claim 122, wherein at least one of     the first shell member and the second shell member comprises a     polymer material. -   136. The seating arrangement of claim 135, wherein the first shell     member and the second shell member each comprise a polymer material. -   137. The seating arrangement of claim 122, wherein at least one of     the support members comprises a metal. -   138. The seating arrangement of claim 122, wherein one of the     support members of the pair of support members is longer than the     remaining support member of the pair of support members. -   139. The seating arrangement of claim 138, wherein the longer     support member is located forwardly of the remaining support member. -   140. The seating arrangement of claim 122, further comprising:

a stop member configured to abut at least one of the pair of support members and limit movement of the first portion of the second shell member between the forward position and the rearward position.

-   141. The seating arrangement of claim 122, wherein the second     portion of the second shell member is movable between an upright     position and a reclined position. -   142. The seating arrangement of claim 141, further comprising:

a stop member configured to limit movement of the second portion of the second shell member between the upright and reclined positions.

-   143. The seating arrangement of claim 122, wherein the stop member     includes a first portion attached to the first shell member and a     second portion attached to the second shell member. -   144. The seating arrangement of claim 143, wherein the first portion     of the stop member includes a slot, and wherein the second portion     of the stop member includes a tab received within the slot. -   145. The seating arrangement of claim 122, wherein the second     portion of the first shell member and the second portion of the     second shell member are attached to one another. -   146. The seating arrangement of claim 122, wherein the seating     arrangement comprises an office chair assembly. -   147. A seating arrangement, comprising:

a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, wherein the first shell member comprises a polymer;

a flexibly resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member, wherein the second shell member comprises a polymer; and

a pair of flexibly resilient support members extending between and supporting the second portion of the first shell member from the second portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member and the pair of flexible members cooperate to form a four-bar linkage arrangement such that the first portion of the second shell member is movable between a forward position and a rearward position, wherein the pair of support members comprise a metal.

-   148. The seating arrangement of claim 147, wherein the at least one     of the support members comprises a substantially flat sheet. -   149. The seating arrangement of claim 148, wherein the pair of     support members comprise a single, integral piece. -   150. The seating arrangement of claim 149, wherein one of the     support members of the pair of support members is longer than the     remaining support member of the pair of support members. -   151. The seating arrangement of claim 150, wherein the longer     support member is located forwardly of the remaining support member. -   152. The seating arrangement of claim 151, further comprising:

a first stop member configured to abut at least one of the pair of support members and limit movement of the first portion of the second shell member between the forward position and the rearward position.

-   153. The seating arrangement of claim 152, wherein the second     portion of the second shell member is movable between an upright     position and a reclined position. -   154. The seating arrangement of claim 153, further comprising:

a second stop member configured to limit movement of the second portion of the second shell member between the upright and reclined positions.

-   155. The seating arrangement of claim 154, wherein the second stop     member includes a first portion attached to the first shell member     and a second portion attached to the second shell member. -   156. The seating arrangement of claim 155, wherein the first portion     of the second stop member includes a slot, and wherein the second     portion of the second stop member includes a tab slidably received     within the slot. -   157. The seating arrangement of claim 147, wherein the pair of     support members comprise a single, integral piece. -   158. The seating arrangement of claim 147, wherein one of the     support members of the pair of support members is longer than the     remaining support member of the pair of support members. -   159. The seating arrangement of claim 158, wherein the longer     support member is located forwardly of the remaining support member. -   160. The seating arrangement of claim 147, further comprising:

a stop member configured to abut at least one of the pair of support members and limit movement of the first portion of the second shell member between the forward position and the rearward position.

-   161. The seating arrangement of claim 147, wherein the second     portion of the second shell member is movable between an upright     position and a reclined position. -   162. The seating arrangement of claim 161, further comprising:

a stop member configured to limit movement of the second portion of the second shell member between the upright and reclined positions.

-   163. The seating arrangement of claim 147, wherein the stop member     includes a first portion attached to the first shell member and a     second portion attached to the second shell member. -   164. The seating arrangement of claim 163, wherein the first portion     of the stop member includes a slot, and wherein the second portion     of the stop member includes a tab received within the slot. -   165. The seating arrangement of claim 147, wherein the second     portion of the first shell member and the second portion of the     second shell member are attached to one another. -   166. The seating arrangement of claim 147, wherein the first portion     of the second shell member is flexibly resilient and more flexible     than the first portion of the first shell member, and wherein the     pair of flexible members are each more flexible than the first     portion of the second shell member. -   167. The seating arrangement of claim 147, wherein the seating     arrangement comprises an office chair assembly. -   168. A seating arrangement, comprising:

a flexibly resilient first shell member having a horizontally-extending first portion, a second portion extending upwardly from the first portion, and an arcuately-shaped transition portion located between the first portion and the second portion;

a flexibly resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell member, a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member, and an arcuately-shaped transition portion located between the first and second portions of the second shell member, wherein the second portion of the first shell member and the second portion of the second shell member are each movable between an upright position and a reclined position; and

a spacer member coupled to one of the first shell member and the second shell member and spaced from the other of the first shell member and second shell member when the second portion of the first shell member and the second portion of the second shell member are in the upright position, and wherein the spacer member abuts the transition portion of the other shell member when the second portion of the first shell member and the second portion of the second shell member are in the reclined position;

a pair of flexibly resilient support members extending between and supporting the second portion of the first shell member from the second portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member and the pair of flexible members cooperate to form a linkage arrangement such that the first portion of the second shell member is movable between a forward position and a rearward position; and

wherein the first portion of the first shell member is flexibly resilient, the first portion of the second shell member is flexibly resilient and more flexible than the first portion of the first shell member, and wherein the pair of flexible support members are each more flexible than the first portion of the second shell member.

-   169. The seating arrangement of claim 168, wherein the second shell     member comprises a seat shell member, and wherein the second portion     of the second shell member is configured to support a seated user     thereon. -   170. The seating arrangement of claim 169, wherein the spacer member     is coupled to the transition portion of the second shell member. -   171. The seating arrangement of claim 170, wherein the spacer member     includes an arcuately-shaped first abutment surface configured to     abut the arcuately-shaped transition portion of the first shell     member. -   172. The seating arrangement of claim 171, wherein the first     abutment surface of the spacer member is complementary to the     transition portion of the first shell member. -   173. The seating arrangement of claim 172, wherein the spacer member     includes an arcuately-shaped second abutment surface that abuts the     transition portion of the second shell member. -   174. The seating arrangement of claim 173, wherein the second     abutment surface of the spacer member is complementary to the     transition portion of the second shell member. -   175. The seating arrangement of claim 168, wherein the spacer member     is coupled to the transition portion of the second shell member. -   176. The seating arrangement of claim 168, wherein the spacer member     includes an arcuately-shaped first abutment surface configured to     abut the arcuately-shaped transition portion of the first shell     member. -   177. The seating arrangement of claim 168, wherein the first     abutment surface of the spacer member is complementary to the     transition portion of the first shell member. -   178. The seating arrangement of claim 168, wherein the spacer member     includes an arcuately-shaped second abutment surface that abuts the     transition portion of the second shell member. -   179. The seating arrangement of claim 168, wherein the second     abutment surface of the spacer member is complementary to the     transition portion of the second shell member. -   180. The seating arrangement of claim 168, further comprising:

a pair of flexibly resilient support members extending between and supporting the second portion of the first shell member from the second portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member and the pair of flexible members cooperate to form a four-bar linkage arrangement such that the first portion of the second shell member is movable between a forward position and a rearward position.

-   181. The seating arrangement of claim 180, wherein the first portion     of the second shell member is more flexible than the first portion     of the first shell member, and wherein the pair of flexible members     are each more flexible than the first portion of the second shell     member. -   182. The seating arrangement of claim 180, wherein the at least one     of the support members comprises a substantially flat sheet. -   183. The seating arrangement of claim 180, wherein the pair of     support members comprise a single, integral piece. -   184. The seating arrangement of claim 180, wherein at least one of     the support members comprises a metal. -   185. The seating arrangement of claim 180, wherein one of the     support members of the pair of support members is longer than the     remaining support member of the pair of support members. -   186. The seating arrangement of claim 185, wherein the longer     support member is located forwardly of the remaining support member. -   187. The seating arrangement of claim 180, further comprising:

a stop member configured to abut at least one of the pair of support members and limit movement of the first portion of the second shell member between the forward position and the rearward position.

-   188. The seating arrangement of claim 168, wherein at least one of     the first shell member and the second shell member comprises a     polymer material. -   189. The seating arrangement of claim 188, wherein the first shell     member and the second shell member each comprise a polymer material. -   190. The seating arrangement of claim 168, further comprising:

a stop member configured to limit movement of the second portion of the second shell member between the upright and reclined positions.

-   191. The seating arrangement of claim 190, wherein the stop member     includes a first portion attached to the first shell member and a     second portion attached to the second shell member. -   192. The seating arrangement of claim 191, wherein the first portion     of the stop member includes a slot, and wherein the second portion     of the stop member includes a tab received within the slot. -   193. The seating arrangement of claim 168, wherein the seating     arrangement comprises an office chair assembly. -   194. The seating arrangement of claim 168, wherein the linkage     arrangement comprises a four-bar linkage arrangement. -   195. A seating arrangement, comprising:

a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position;

a flexibly resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell portion and movable between a forward position and a rearward position, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell and flexible between a first position and a second position; and

a link member coupling the second shell member to the second portion of the first shell member such that movement of the second portion of the first shell member from the upright position to the reclined position moves the first portion of the second shell member from the forward position to the rearward position, and such that flexing of the second portion of the second shell member does not move the first portion of the second shell between the forward position and the rearward position.

-   196. The seating arrangement of claim 195, wherein at least one of     the link member and the second shell member includes an aperture,     and the other of the link member and the second shell member passes     through the aperture. -   197. The seating arrangement of claim 196, wherein the link member     includes the aperture. -   198. The seating arrangement of claim 197, wherein the second shell     member is coupled to the second portion of the first shell member at     a connection position that is spaced from the link member. -   199. The seating arrangement of claim 198, wherein the connection     position is located at a greater vertical height than the link     member. -   200. The seating arrangement of claim 199, wherein at least a     portion of the second portion of the first shell member extends     upwardly from the connection position. -   201. The seating arrangement of claim 200, wherein the second     portion of the second shell member extends upwardly from the     connection position. -   202. The seating arrangement of claim 201, further comprising:

a pair of flexibly resilient support members extending between and supporting the first portion of the second shell member from the first portion of the first shell member such that the first portion of the first shell member, the first portion of the second shell member and the pair of flexible members cooperate to form a four-bar linkage such that the first portion of the second shell member is movable between the first position and the second position.

-   203. The seating arrangement of claim 202, wherein the first portion     of the first shell member is flexibly resilient, the first portion     of the second shell member is flexibly resilient and more flexible     than the first portion of the first shell member, and wherein the     pair of flexible members are each more flexible than the first     portion of the second shell member. -   204. The seating arrangement of claim 202, wherein the at least one     of the support members comprises a substantially flat sheet. -   205. The seating arrangement of claim 202, wherein the pair of     support members comprise a single, integral piece. -   206. The seating arrangement of claim 195, wherein second shell     member is coupled to the second portion of the first shell member at     a connection position that is spaced from the link member. -   207. The seating arrangement of claim 206, wherein the connection     position is located at a greater vertical height than the link     member. -   208. The seating arrangement of claim 206, wherein at least a     portion of the second portion of the first shell member extends     upwardly from the connection position. -   209. The seating arrangement of claim 206, wherein the second     portion of the second shell member extends upwardly from the     connection position. -   210. The seating arrangement of claim 195, wherein the seating     arrangement comprises on office chair assembly. -   211. The seating arrangement of claim 195, further comprising:

a pair of flexibly resilient support members extending between and supporting the first portion of the second shell member from the first portion of the first shell member such that the first portion of the first shell member, the first portion of the second shell member and the pair of flexible members cooperate to form a four-bar linkage such that the first portion of the second shell member is movable between the first position and the second position.

-   212. A seating arrangement, comprising:

a flexibly resilient rear shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position;

a back support member positioned forwardly of the second portion of the rear shell member and configured to support the back of a seated user, the back support member having an aperture extending therethrough; and

a seat shell member configured to support a seated user and including a forward portion and a rearward portion extending through the aperture of the back support member and coupled to the second portion of the rear shell member such that moving the second portion of the rear shell member between the upright and reclined positions moves the seat shell member between a first position and a second position.

-   213. The seating arrangement of claim 212, wherein the back support     member is flexibly resilient. -   214. The seating arrangement of claim 213, wherein the seat shell     member is flexibly resilient. -   215. The seating arrangement of claim 214, wherein the seat shell     member is coupled to the second portion of the rear shell member at     a first position, and wherein the back support member is coupled to     the second portion of the rear shell member at a second position     that is spaced from the first position. -   216. The seating arrangement of claim 215, wherein the second     position is located at a greater vertical height than the first     position. -   217. The seating arrangement of claim 216, wherein at least a     portion of the second portion of the rear shell member extends     upwardly from the second position. -   218. The seating arrangement of claim 217, wherein the back support     member extends upwardly from the second position. -   219. The seating arrangement of claim 212, further comprising:

a pair of flexibly resilient support members extending between and supporting the seat shell member from the first portion of the rear shell member such that the seat shell member, the first portion of the second shell member and the pair of flexible members cooperate to form a four-bar linkage such that the seat shell member is movable between the first position and the second position.

-   220. The seating arrangement of claim 219, wherein the first portion     of the rear shell member is flexibly resilient, the seat shell     member is more flexible than the first portion of the rear shell     member, and wherein the pair of flexible members are each more     flexible than the seat shell member. -   221. The seating arrangement of claim 219, wherein the at least one     of the support members comprises a substantially flat sheet. -   222. The seating arrangement of claim 219, wherein the pair of     support members comprise a single, integral piece. -   223. The seating arrangement of claim 219, wherein the back support     member is flexibly resilient. -   224. The seating arrangement of claim 223, wherein the seat shell     member is coupled to the second portion of the rear shell member at     a first position, and wherein the back support member is coupled to     the second portion of the rear shell member at a second position     that is spaced from the first position. -   225. The seating arrangement of claim 224, wherein the second     position is located at a greater vertical height than the first     position. -   226. The seating arrangement of claim 225, wherein at least a     portion of the second portion of the rear shell member extends     upwardly from the second position. -   227. The seating arrangement of claim 225, wherein the back support     member extends upwardly from the second position. -   228. The seating arrangement of claim 212, wherein the seating     arrangement comprises on office chair assembly. -   229. A seating arrangement, comprising:

a flexibly resilient rear shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position;

a flexibly resilient back support member positioned forwardly of the second portion of the rear shell member and configured to support the back of a seated user; and

a seat shell member configured to support a seated user and including a forward portion and a rearward portion coupled to the second portion of the rear shell member such that moving the second portion of the rear shell member between the upright and reclined positions moves the seat shell member from a first position to a second position without flexing the back support member.

-   230. The seating arrangement of claim 229, wherein the seat shell     member is flexibly resilient. -   231. The seating arrangement of claim 230, wherein the seat shell     member is coupled to the second portion of the rear shell member at     a first position, and wherein the back support member is coupled to     the second portion of the rear shell member at a second position     that is spaced from the first position. -   232. The seating arrangement of claim 231, wherein the second     position is located at a greater vertical height than the first     position. -   233. The seating arrangement of claim 232, wherein at least a     portion of the second portion of the rear shell member extends     upwardly from the second position. -   234. The seating arrangement of claim 233, wherein the back support     member extends upwardly from the second position. -   235. The seating arrangement of claim 229, further comprising:

a pair of flexibly resilient support members extending between and supporting the seat shell member from the first portion of the rear shell member such that the seat shell member, the first portion of the second shell member and the pair of flexible members cooperate to form a four-bar linkage such that the seat shell member is movable between the first position and the second position.

-   236. The seating arrangement of claim 235, wherein the seat shell     member is more flexible than the first portion of the rear shell     member, and wherein the pair of flexible members are each more     flexible than the seat shell member. -   237. The seating arrangement of claim 235, wherein the at least one     of the support members comprises a substantially flat sheet. -   238. The seating arrangement of claim 235, wherein the pair of     support members comprise a single, integral piece. -   239. The seating arrangement of claim 229, wherein the seat shell     member is coupled to the second portion of the rear shell member at     a first position, and wherein the back support member is coupled to     the second portion of the rear shell member at a second position     that is spaced from the first position. -   240. The seating arrangement of claim 239, wherein the second     position is located at a greater vertical height than the first     position. -   241. The seating arrangement of claim 240, wherein at least a     portion of the second portion of the rear shell member extends     upwardly from the second position. -   242. The seating arrangement of claim 240, wherein the back support     member extends upwardly from the second position. -   243. The seating arrangement of claim 229, wherein the seating     arrangement comprises on office chair assembly. -   244. A seating arrangement, comprising:

a flexibly resilient rear shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position;

a flexibly resilient back support member positioned forwardly of the second portion of the rear shell member and configured to support the back of a seated user;

a seat shell member configured to support a seated user, wherein moving the second portion of the rear shell member between the upright and reclined positions moves the seat shell member between a forward location and a rearward location; and

a pair of support members extending between and supporting the seat shell member from the second portion of the rear shell member, such that the first portion of the first shell member, the first section of the second shell member and the support members cooperate to form a four-bar linkage; and

wherein moving the second portion of the rear shell member between the upright and reclined positions moves the seat shell member between the forward and rearward positions without flexing the back support member.

-   245. The seating arrangement of claim 244, wherein the seat shell     member is flexibly resilient. -   246. The seating arrangement of claim 245, wherein the pair of     support members are flexibly resilient. -   247. The seating arrangement of claim 246, wherein the seat shell     member is coupled to the second portion of the rear shell member at     a first position, and wherein the back support member is coupled to     the second portion of the rear shell member at a second position     that is spaced from the first position. -   248. The seating arrangement of claim 247, wherein the second     position is located at a greater vertical height than the first     position. -   249. The seating arrangement of claim 248, wherein at least a     portion of the second portion of the rear shell member extends     upwardly from the second position. -   250. The seating arrangement of claim 249, wherein the back support     member extends upwardly from the second position. -   251. The seating arrangement of claim 250, wherein the seat shell     member is more flexible than the first portion of the rear shell     member, and wherein the pair of flexible members are each more     flexible than the seat shell member. -   252. The seating arrangement of claim 244, wherein the at least one     of the support members comprises a substantially flat sheet. -   253. The seating arrangement of claim 244, wherein the pair of     support members comprise a single, integral piece. -   254. The seating arrangement of claim 244, wherein the seat shell     member is coupled to the second portion of the rear shell member at     a first position, and wherein the back support member is coupled to     the second portion of the rear shell member at a second position     that is spaced from the first position. -   255. The seating arrangement of claim 254, wherein the second     position is located at a greater vertical height than the first     position. -   256. The seating arrangement of claim 254, wherein at least a     portion of the second portion of the rear shell member extends     upwardly from the second position. -   257. The seating arrangement of claim 254, wherein the back support     member extends upwardly from the second position. -   258. The seating arrangement of claim 244, wherein the pair of     support members are flexibly resilient. -   259. The seating arrangement of claim 244, wherein the seating     arrangement comprises on office chair assembly. -   260. A seating arrangement, comprising:

a flexibly resilient shell member having a horizontally-extending lower portion, an upper portion extending upwardly from the lower portion, and a transition portion located between the lower portion and the upper portion, the upper portion movable between an upright position and a reclined position, the lower portion including a U-shaped aperture having a base portion and a pair of arm portions extending forwardly from the base portion, wherein the aperture is configured such that a portion of the rear shell member immediately adjacent to the base portion of the U-shaped aperture travels downwardly as the upper portion is moved from the upright position to the reclined position.

-   261. The seating arrangement of claim 260, wherein the portion of     the shell member immediately adjacent to the base portion comprises     the transition portion. -   262. The seating arrangement of claim 261, wherein the base portion     of the U-shaped aperture is at least partially vertically aligned     with the upper portion of the shell member when the upper portion is     in the upright position. -   263. The seating arrangement of claim 262, wherein the lower portion     includes a bottom wall and a pair of sidewalls extending upwardly     from the bottom wall, and wherein the arm portions of the U-shaped     aperture are located within the bottom wall and proximate the     sidewalls. -   264. The seating arrangement of claim 263, wherein the transition     portion includes at least one aperture. -   265. The seating arrangement of claim 264, wherein the at least one     aperture of the transition portion includes a plurality of apertures     that cooperate to divide the transition portion into a pair of tabs. -   266. The seating arrangement of claim 265, wherein the plurality of     apertures of the transition portion includes a pair of first     apertures each having a first end and a second end located downward     and outwardly from the first end, and a laterally-extending second     aperture having a first end located proximate the second end of one     of the first apertures and a second end located proximate the second     end of the other of the first apertures. -   267. The seating arrangement of claim 266, wherein the plurality of     apertures of the transition portion further includes a     vertically-extending third aperture in communication with the second     aperture of the plurality of apertures. -   268. The seating arrangement of claim 264, wherein the at least one     aperture of the transition portion extends into the upper portion of     the rear shell member. -   269. The seating arrangement of claim 268, wherein the upper portion     of the shell member includes an aperture that is separated from the     aperture located within the transition portion and extending into     the upper portion. -   270. The seating arrangement of claim 269, wherein the aperture of     the upper portion that is separated from the aperture locate within     the transition portion and extends into the upper portion covers a     majority of the upper portion of the shell member. -   271. The seating arrangement of claim 270, further comprising:

an elastically resilient reinforcement member that extends along a centroidal axis of the upper portion of the rear shell member.

-   272. The seating arrangement of claim 271, wherein the reinforcement     member comprises an elongated rod. -   273. The seating arrangement of claim 271, further comprising:

a support assembly supporting the shell member, and wherein the reinforcement member is coupled to the support assembly.

-   274. The seating arrangement of claim 260, wherein the base portion     of the U-shaped aperture is at least partially vertically aligned     with the upper portion of the shell member when the upper portion is     in the upright position. -   275. The seating arrangement of claim 260, wherein the lower portion     includes a bottom wall and a pair of sidewalls extending upwardly     from the bottom wall, and wherein the arm portions of the U-shaped     aperture are located within the bottom wall and proximate the     sidewalls. -   276. The seating arrangement of claim 260, wherein the transition     portion includes at least one aperture. -   277. The seating arrangement of claim 276, wherein the at least one     aperture of the transition portion includes a plurality of apertures     that cooperate to divide the transition portion into a pair of tabs. -   278. The seating arrangement of claim 277, wherein the plurality of     apertures of the transition portion includes a pair of first     apertures each have a first end and a second end located downward     and outwardly from the first end, and a laterally-extending second     aperture having a first end located proximate the second end of one     of the first apertures and a second end located proximate the second     end of the other of the first apertures. -   279. The seating arrangement of claim 278, wherein the plurality of     apertures of the transition portion further includes a     vertically-extending third aperture in communication with the second     aperture of the plurality of apertures. -   280. The seating arrangement of claim 276, wherein the at least one     aperture of the transition portion extends into the upper portion of     the shell member. -   281. The seating arrangement of claim 276, wherein the upper portion     of the shell member includes an aperture that is separated from the     at least one aperture located within the transition portion. -   282. The seating arrangement of claim 281, wherein the aperture of     the upper portion that is separated from the aperture locate within     the transition portion covers a majority of the upper portion of the     shell member. -   283. The seating arrangement of claim 260, further comprising:

an elastically resilient reinforcement member that extends along a centroidal axis of the upper portion of the shell member.

-   284. The seating arrangement claim 283, wherein the reinforcement     member comprises an elongated rod. -   285. The seating arrangement of claim 284, further comprising:

a support assembly supporting the rear shell member, and wherein the reinforcement member is coupled to the support assembly.

-   286. The seating arrangement of claim 260, wherein the flexibly     resilient shell member comprises a rear shell member; and further     comprising:

a flexibly resilient front shell member having a horizontally-extending lower portion located above the lower portion of the rear shell member, an upper portion extending upwardly from the lower portion and located forwardly of the upper portion of the rear shell member, and a transition portion located between the lower portion and the upper portion.

-   287. The seating arrangement of claim 286, wherein the transition     portion of the front shell member includes a laterally-extending     aperture. -   288. The seating arrangement of claim 287, wherein the lower portion     of the front shell member includes a U-shaped aperture having a base     portion and a pair of arm portions extending forwardly from the base     portion. -   289. The seating arrangement of claim 286, wherein the lower portion     of the front shell member includes a U-shaped aperture having a base     portion and a pair of arm portions extending forwardly from the base     portion. -   290. The seating arrangement of claim 289, wherein the arm portions     angle outwardly from one another from the base portion towards a     distal end of each of the arm portions. -   291. The seating arrangement of claim 286, wherein the front shell     member comprises a polymer material. -   292. The seating arrangement of claim 291, wherein the rear shell     member comprises a polymer material. -   293. The seating arrangement of claim 286, wherein the front shell     member comprises an integral, single piece. -   294. The seating arrangement of claim 260, further comprising:

at least one biasing member coupled to the lower portion of the shell member and the upper portion of the shell member and biasing the upper portion of the shell member from the reclined position to the upright position.

-   295. The seating arrangement of claim 294, wherein the at least one     biasing member includes a pair of laterally-spaced biasing members. -   296. The seating arrangement of claim 294, wherein the at least one     biasing member is L-shaped. -   297. The seating arrangement of claim 294, further comprising:

a first stop member that is fixed with respect to the lower portion of the shell member, and wherein the at least one biasing member includes a second stop member that abuts the first stop member when the upper portion of the shell member is in the reclined position.

-   298. The seating arrangement of claim 260, further comprising:

a first stop member that is fixed with respect to the lower portion of the shell member and a second stop member that is fixed with respect to the upper portion of the shell member and that abuts the first stop member when the upper portion of the shell member is in the reclined position.

-   299. The seating arrangement of claim 260, wherein the flexible     shell member comprises a polymer material. -   300. The seating arrangement of claim 260, wherein the seating     arrangement comprises an office chair assembly. -   301. A seating arrangement, comprising:

a flexibly resilient shell member supported by a support assembly and having a horizontally-extending lower portion, an upper portion extending upwardly from the lower portion, and a transition portion located between the lower portion and the upper portion, the upper portion movable between an upright position and a reclined position;

at least one biasing member coupled to the lower portion of the shell member and the upper portion of the shell member and biasing the upper portion of the shell member from the reclined position to the upright position; and

a first stop member that is fixed with respect to the lower portion of the shell member, and wherein the at least one biasing member includes a second stop member that abuts the first stop member when the upper portion of the shell member is in the reclined position.

-   302. The seating arrangement of claim 301, wherein the at least one     biasing member includes a flexibly resilient member attached to the     lower portion and the upper portion. -   303. The seating arrangement of claim 302, wherein the at least one     biasing member comprises an L-shape. -   304. The seating arrangement of claim 303, wherein the at least one     biasing member comprises a pair of biasing members. -   305. The seating arrangement of claim 304, wherein the first stop     member comprises a plate attached to the lower portion of the shell     member. -   306. The seating arrangement of claim 301, wherein the at least one     biasing member comprises an L-shape. -   307. The seating arrangement of claim 301, wherein the at least one     biasing member comprises a pair of biasing members. -   308. The seating arrangement of claim 301, wherein the first stop     member comprises a plate attached to the lower portion of the shell     member. -   309. A seating arrangement, comprising:

a flexibly resilient shell member having a horizontally-extending lower portion, an upper portion extending upwardly from the lower portion, and a transition portion located between the lower portion and the upper portion, the upper portion movable between an upright position and a reclined position, the lower portion including a laterally-extending aperture, wherein the aperture is configured such that a portion of the shell member immediately rearward to the aperture travels downwardly with respect to a portion of the shell member immediately forward of the aperture as the upper portion is moved from the upright position to the reclined position.

-   310. The seating arrangement of claim 309, wherein the aperture is     at least partially vertically aligned with the upper portion of the     shell member when the upper portion is in the upright position. -   311. The seating arrangement of claim 309, wherein the portion of     the shell member immediately adjacent to the base portion comprises     the transition portion. -   312. A seating arrangement, comprising:

a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion movable between an upright position and a reclined position, where the first portion includes an inner portion and at least one outer portion located laterally outward of the inner portion, and where the inner portion flexes a different amount than the outer portion as the second portion is moved between the upright and reclined positions; and

a flexibly resilient second shell member having a horizontally-extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the first shell, wherein a downward force on the inner portion of the first portion of the first shell member exerts a force on the second portion of the second shell from the recline position toward the upright position.

-   313. The seating arrangement of claim 312, wherein the at least one     outer portion includes a pair of outer portions located on opposite     sides of the inner portion from one another. -   314. The seating arrangement of claim 313, wherein the first shell     member includes a pair of extending slots extending in a fore-to-aft     direction that divide the inner portion from the outer portion. -   315. The seating arrangement of claim 314, wherein the slots are     located within the first portion of the first shell member. -   316. The seating arrangement of claim 315, wherein the slots are     located within the second portion of the first shell member. -   317. The seating arrangement of claim 316, wherein the inner portion     flexes less that the outer portions as the second portion of the     second shell member is moved from the upright to the reclined     position. -   318. The seating arrangement of claim 317, wherein the first shell     member includes an uninterrupted outer edge extending about an     entire perimeter of the first shell member. -   319. The seating arrangement of claim 318, further comprising:

a cover member extending about a majority of the outer edge of the first shell member.

-   320. The seating arrangement of claim 319, wherein the second     portion of the second shell member is movable between an upright     position and a reclined position. -   321. The seating arrangement of claim 312, wherein the first shell     member includes at least one slot extending in a fore-to-aft     direction that divides the inner portion from the at least one outer     portion. -   322. The seating arrangement of claim 321, wherein the at least one     slot is located within the first portion of the first shell member. -   323. The seating arrangement of claim 322, wherein the at least one     slot is located within the second portion of the first shell member. -   324. The seating arrangement of claim 312, wherein the inner portion     flexes less that the at least one outer portion as the second     portion of the second shell member is moved from the upright to the     reclined position. -   325. The seating arrangement of claim 312, wherein the first shell     member includes an uninterrupted outer edge extending about an     entire perimeter of the first shell member. -   326. The seating arrangement of claim 325, further comprising:

a cover member extending about a majority of the outer edge of the first shell member.

-   327. The seating arrangement of claim 312, wherein the second     portion of the second shell member is movable between an upright     position and a reclined position. -   328. The seating arrangement of claim 312, further comprising:

a stop arrangement configured to limit movement of the second portion of the first shell member from the upright position toward the reclined position.

-   329. The seating arrangement of claim 328, wherein the stop     arrangement is attached to the first portion of the second shell     member. -   330. The seating arrangement of claim 329, wherein the stop     arrangement comprises a link member extending from the first portion     of the second shell member to the first portion of the first shell     member. -   331. The seating arrangement of claim 312, wherein the inner portion     of the first shell member flexes upwardly with respect to the at     least one outer portion as the second portion of the first shell     member moves from the upright position toward the recline position. -   332. The seating arrangement of claim 312, wherein the seating     arrangement comprises an office chair assembly. -   333. A seating arrangement, comprising:

a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the first portion configured to support a seated user and including a flexible tab member configured to flex independently from a majority of the first shell member, and the second portion configured to move between an upright position and a reclined position;

a second shell member having a horizontally extending first portion at least partially spaced from the first portion of the first shell member; and

a first support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member, wherein the support member is attached to the tab member of the first portion of the first shell member, and where the tab flexes a greater amount than the majority of the first portion of the first shell member as the second portion of the first shell member is moved from the upright position to the reclined position.

-   334. The seating arrangement of claim 333, wherein the tab includes     a portion having a reduced thickness that is less than a thickness     of the majority of the first portion of the first shell member. -   335. The seating arrangement of claim 334, wherein the portion of     the tab having reduced thickness is located forward of a location at     which the first support member is connected to the tab. -   336. The seating arrangement of claim 335, wherein the first support     member is flexibly resilient. -   337. The seating arrangement of claim 336, further comprising:

a second support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member, such that the first portion of the first shell member, the first portion of the second shell member, the first support member and the second support member cooperate to form a four-bar linkage.

-   338. The seating arrangement of claim 337, wherein the second     support member is substantially rigid. -   339. The seating arrangement of claim 338, wherein the second     support member is located rearward of the first support element. -   340. The seating arrangement of claim 333, wherein the first support     member is flexibly resilient. -   341. The seating arrangement of claim 333, further comprising:

a second support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member, such that the first portion of the first shell member, the first portion of the second shell member, the first support member and the second support member cooperate to form a four-bar linkage.

-   342. The seating arrangement of claim 341, wherein the second     support member is substantially rigid. -   343. The seating arrangement of claim 333, wherein the seating     arrangement comprises an office chair assembly. -   344. A seating arrangement, comprising:

a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion of the first shell member movable between an upright position and a reclined position;

a flexibly resilient second shell member having a horizontally extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member, wherein the first portion of the second shell member includes a reduced thickness region where the thickness of the first portion of the second shell member is less than a thickness of the a majority of the first portion of the second shell member;

a flexibly resilient first support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member, where the first support member includes a reduced thickness region where the thickness of the first support member is less than a thickness of a majority of the first support member; and

a second support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member, first support member, and the second support member cooperate to form a linkage arrangement; and

wherein the reduced thickness region of the first portion of the second shell member flexes more than the majority of the first portion of the second shell member and the reduced thickness region of the first support member flexes more than the majority of the first support member as the second portion of the first shell member moves from the upright to the reclined positions.

-   345. The seating arrangement of claim 344, wherein the reduced     thickness region of the first support member is located proximate a     lower end of the first support member. -   346. The seating arrangement of claim 345, wherein the reduced     thickness region of the first section of the second shell member is     located forward of a location at which the second support member     connects to the second shell member. -   347. The seating arrangement of claim 346, wherein the second     support member is substantially rigid. -   348. The seating arrangement of claim 347, wherein the first portion     of the first shell member includes a flexible tab member configured     to flex independently from the majority of the first shell member,     the first support member is connected to the tab, and wherein the     tab flexes a greater amount than the majority of the first portion     of the first shell member as the second portion of the first shell     member is moved from the upright position to the reclined position. -   349. The seating arrangement of claim 348, wherein the tab includes     a portion having a reduced thickness that is less than a thickness     of the majority of the first portion of the first shell member. -   350. The seating arrangement of claim 349, wherein the portion of     the tab having reduced thickness is located forward of a location at     which the first support member is connected to the tab. -   351. The seating arrangement of claim 344, wherein the reduced     thickness region of the first section of the second shell member is     located forward of a location at which the second support member     connects to the second shell member. -   352. The seating arrangement of claim 344, wherein the second     support member is substantially rigid. -   353. The seating arrangement of claim 344, wherein the first portion     of the first shell member includes a flexible tab member configured     to flex independently from the majority of the first shell member,     the first support member is connected to the tab, and wherein the     tab flexes a greater amount than the majority of the first portion     of the first shell member as the second portion of the first shell     member is moved from the upright position to the reclined position. -   354. The seating arrangement of claim 353, wherein the tab includes     a portion having a reduced thickness that is less than a thickness     of the majority of the first portion of the first shell member. -   355. The seating arrangement of claim 354, wherein the portion of     the tab having reduced thickness is located forward of a location at     which the first support member is connected to the tab. -   356. The seating arrangement of claim 344, wherein the linkage     arrangement comprises a four-bar linkage arrangement. -   357. The seating arrangement of claim 344, wherein the seating     arrangement comprises an office chair assembly. -   358. A seating arrangement, comprising:

a base;

a back arrangement configured to support a seated user and moveable between an upright position and a reclined position;

a seat arrangement configured to support a seated user; and

a control mechanism that supports the seat arrangement and back arrangement on the base and is configured to synchronously move the seat arrangement and the back arrangement as the back arrangement moves between the upright and recline positions, the chair control mechanism including a hollow element that includes a pair of walls that cooperate to define a cavity and a control rod, the control rod being positioned to project into the cavity of the hollow element and interact with the pair of walls of the hollow element such that the control rod abuts one of the walls of the pair of walls when the back arrangement is in the upright position and the other wall of the pair of walls when the back arrangement is in the reclined position.

-   359. The seating arrangement of claim 358, wherein the seat     arrangement comprises a flexible shell member. -   360. The seating arrangement of claim 359, wherein the flexible     shell member includes the back arrangement. -   361. The seating arrangement of claim 360, wherein the flexible     shell member comprises a first shell member, and wherein the base     comprises a second shell member. -   362. The seating arrangement of claim 361, wherein control rod is     fixed for movement with respect to the base. -   363. The seating arrangement of claim 362, further comprising:

a flexibly resilient linkage member connected to the base and to the seat arrangement.

-   364. The seating arrangement of claim 363, wherein the base, the     seat arrangement, the hollow element and the linkage member     cooperate to form a four-bar linkage arrangement. -   365. The seating arrangement of claim 364, wherein the four-bar     linkage defines an interior space, and wherein control rod is at     least partially located within the interior space. -   366. The seating arrangement of claim 365, wherein the control rod     includes at least one stop member located at a distal end thereof. -   367. The seating arrangement of claim 365, wherein the control rod     includes a pair of stop members extending substantially in opposite     directions from one another. -   368. The seating arrangement of claim 358, wherein the flexible     shell member includes the back arrangement. -   369. The seating arrangement of claim 358, wherein the shell member     comprises a first shell member, and wherein the base comprises a     flexible resilient second shell member. -   370. The seating arrangement of claim 358, wherein control rod is     fixed for movement with respect to the base. -   371. The seating arrangement of claim 358, further comprising:

a flexibly resilient linkage member connected to the base and to the seat arrangement.

-   372. The seating arrangement of claim 371, wherein the base, the     seat arrangement, the hollow element and the linkage member     cooperate to form a four-bar linkage arrangement. -   373. The seating arrangement of claim 372, wherein the four-bar     linkage defines an interior space, and wherein control rod is at     least partially located within the interior space. -   374. The seating arrangement of claim 358, wherein the control rod     includes at least one stop member located at a distal end thereof. -   375. The seating arrangement of claim 358, wherein the control rod     includes a pair of stop members extending substantially in opposite     directions from one another. -   376. The seating arrangement of claim 358, wherein the hollow     element is substantially rigid. -   377. The seating arrangement of claim 358, wherein the seating     arrangement comprises an office chair assembly. -   378. A seating arrangement, comprising:

a base;

a back arrangement configured to support a seated user and moveable between an upright position and a reclined position;

a seat arrangement configured to support a seated user; and

a support arrangement supported by the base including a stop arrangement configured to limit a movement of the back arrangement between the upright position and the reclined position, and that includes a coupling arrangement configured to couple a chair accessory to the support arrangement.

-   379. The seating arrangement of claim 378, wherein the accessory     includes at least one of an arm assembly and a leg assembly. -   380. The seating arrangement of claim 379, wherein the coupling     arrangement is configured to detachably couple the chair accessory     to the support arrangement. -   381. The seating arrangement of claim 380, wherein the stop     arrangement includes a control rod configured to abut a stop member. -   382. The seating arrangement of claim 381, wherein the control rod     is configured to abut at least one interior wall of a hollow     element. -   383. The seating arrangement of claim 378, wherein the coupling     arrangement is configured to detachably couple the chair accessory     to the support arrangement. -   384. The seating arrangement of claim 378, wherein the stop     arrangement includes a control rod configured to abut a stop member. -   385. The seating arrangement of claim 384, wherein the control rod     is configured to abut at least one interior wall of a hollow     element. -   386. The seating arrangement of claim 378, wherein the back and seat     arrangement comprise a flexibly resilient shell member. -   387. The seating arrangement of claim 378, further including:

a pair of link members that cooperate with the base arrangement and the seat arrangement to form a four-bar linkage arrangement.

-   388. The seating arrangement of claim 387, wherein the four-bar     linkage arrangement defines an interior space, and wherein the     support arrangement is at least partially located within the     interior space of the four-bar linkage arrangement. -   389. The seating arrangement of claim 378, wherein the seating     arrangement comprises an office chair assembly. -   390. A seating arrangement, comprising:

a base;

a back arrangement and a seat arrangement supported by the base, where the back arrangement is movable between an upright position and a reclined position;

a shell supported on the base and forming at least a portion of the seat arrangement, the shell having a substantially uninterrupted perimeter edge and a seating support region, a portion of the substantially uninterrupted perimeter edge of the shell defining a front edge section and another portion of the substantially continuous perimeter edge defining side edge sections rearward of the front edge section and adjacent the seating support region, at least two slots being formed in the seating support region of the shell at a position spaced from the front edge section and generally adjacent to the side edge sections; and

a force activated control mechanism attached to the seating support region such that, upon movement of the chair into the recline position, the seating support region of the shell increases in height relative to the side edge sections of the shell.

-   391. The seating arrangement of claim 390, wherein the seating     support region comprises an inner portion divided from a pair of     outer portions by the two slots, and wherein the inner portion     flexes a different amount than the outer portions as the back     arrangement is moved between the upright and reclined positions. -   392. The seating arrangement of claim 391, wherein the slots are at     least partially located in the seat arrangement. -   393. The seating arrangement of claim 392, wherein the slots are at     least partially located in the back arrangement. -   394. The seating arrangement of claim 393, wherein the shell     includes a flexibly resilient first shell member, and wherein the     base comprises a flexibly resilient second shell member. -   395. The seating arrangement of claim 394, wherein the control     mechanism is configured to move the arrangement from the reclined     position to the upright position when a user exerts a downward force     on the seating support region. -   396. The seating arrangement of claim 395, wherein the force     activated control mechanism includes a pair of linkage member that     cooperate with the seat arrangement and the base to form a four-bar     linkage arrangement. -   397. The seating arrangement of claim 390, wherein the slots are at     least partially located in the seat arrangement. -   398. The seating arrangement of claim 397, wherein the slots are at     least partially located in the back arrangement. -   399. The seating arrangement of claim 390, wherein the shell     includes a flexibly resilient first shell member, and wherein the     base comprises a flexibly resilient second shell member. -   400. The seating arrangement of claim 390, wherein the control     mechanism is configured to move the arrangement from the reclined     position to the upright position when a user exerts a downward force     on the seating support region. -   401. The seating arrangement of claim 390, wherein the force     activated control mechanism includes a pair of linkage member that     cooperate with the seat arrangement and the base to form a four-bar     linkage arrangement. -   402. The seating arrangement of claim 390, wherein the seating     arrangement comprises an office chair assembly. -   403. A seating arrangement, comprising:

a support assembly configured to abut a floor surface;

an integral, one-piece support shell defining a back portion configured to support a seated user and seat portion configured to support a seated user; and

a control member including a plurality of flexing regions and a plurality of support elements, where the one-piece support shell is supported in the seat portion by at least one of the plurality of support elements and at least one of the plurality of flexing regions both positioned forwardly of a connection point between the support assembly and the control member, and by at least one of the plurality of support elements and at least one of the plurality of flexing regions both positioned rearwardly of the connection point.

-   404. The seating arrangement of claim 403, wherein a portion of the     control member that includes the at least one of the plurality of     support elements positioned forwardly of the connection point and     the at least one of the plurality of flexing regions positioned     forwardly of the connection point comprises a single, integral     piece. -   405. The seating arrangement of claim 404, wherein at least one of     the plurality of support elements positioned forwardly of the     connection point includes at least one of the plurality of flexing     regions located forwardly of the connection point. -   406. The seating arrangement of claim 405, wherein at least one of     the plurality flexing regions comprises a region of reduced relative     thickness. -   407. The seating arrangement of claim 406, wherein the at least one     of the plurality of support elements positioned forwardly of the     connection point is substantially rigid along a majority of a length     thereof. -   408. The seating arrangement of claim 407, wherein the at least one     of the plurality of support elements positioned rearwardly of the     connection point is substantially rigid. -   409. The seating arrangement of claim 408, wherein the at least one     of the plurality of flexing regions positioned rearwardly of the     connection point is positioned between the connection point and the     at least one of the support elements positioned rearwardly of the     connection point. -   410. The seating arrangement of claim 409, wherein the one-piece     support shell includes a flex zone. -   411. The seating arrangement of claim 409, wherein the flex zone is     rearward of the at least one of the plurality of support elements     positioned forwardly of the connection point and forwardly of the at     least one of the plurality of support elements positioned rearwardly     of the connection point. -   412. The seating arrangement of claim 411, wherein the support shell     comprises a front shell member, and wherein the control member     comprises a rear shell member positioned rearward of the front shell     member. -   413. The seating arrangement of claim 412, wherein the support     assembly comprises a pneumatic height adjustment cylinder. -   414. The seating arrangement of claim 403, wherein at least one of     the plurality of support elements positioned forwardly of the     connection point includes at least one of the plurality of flexing     regions located forwardly of the connection point. -   415. The seating arrangement of claim 403, wherein at least one of     the plurality flexing regions comprises a region of reduced relative     thickness. -   416. The seating arrangement of claim 403, wherein the at least one     of the plurality of support elements positioned forwardly of the     connection point is substantially rigid along a majority of a length     thereof. -   417. The seating arrangement of claim 403, wherein the at least one     of the plurality of support elements positioned rearwardly of the     connection point is substantially rigid. -   418. The seating arrangement of claim 403, wherein the at least one     of the plurality of flexing regions positioned rearwardly of the     connection point is positioned between the connection point and the     at least one of the support elements positioned rearwardly of the     connection point. -   419. The seating arrangement of claim 403, wherein the one-piece     support shell includes a flex zone. -   420. The seating arrangement of claim 419, wherein the flex zone is     rearward of the at least one of the plurality of support elements     positioned forwardly of the connection and forwardly of the at least     one of the plurality of support elements positioned rearwardly of     the connection point. -   421. The seating arrangement of claim 403, wherein the support     assembly comprises a pneumatic height adjustment cylinder. -   422. The seating arrangement of claim 403, wherein the support shell     and the control arrangement cooperate to form a four-bar linkage     arrangement. -   423. The seating arrangement of claim 403, wherein the seating     arrangement comprises an office chair assembly. -   424. A seating arrangement, comprising:

a support shell including a seat portion configured to support a seated user and a chair back portion configured to support a seated user, the chair seat portion having a front region and a rear region and the chair back portion having an upper region and a lower region, where the rear region of the seat portion is coupled to the lower region of the chair back portion; and

a control member including a front support and an attachment point for a second support, where the front support engages the support shell in the front region of the seat portion and the control member engages the back portion; and

wherein the control member is an integral, one-piece component including multiple flex regions configured to allow the support shell to move between an upright and reclined position.

-   425. The seating arrangement of claim 424, further comprising:

a support assembly configured to abut a floor surface, where the front support is located forwardly of a connection point between the support assembly and the control member.

-   426. The seating arrangement of claim 425, wherein the attachment     point is located rearwardly of the connection point. -   427. The seating arrangement of claim 426, wherein at least one of     the multiple flex regions is located forwardly of the connection     point. -   428. The seating arrangement of claim 427, wherein at least one of     the of the multiple flex regions is located rearwardly of the     attachment point. -   429. The seating arrangement of claim 428, wherein at least one of     the multiple flex regions includes an area of reduced relative     thickness. -   430. The seating arrangement of claim 429, wherein the support shell     is an integral, one-piece component. -   431. The seating arrangement of claim 430, wherein the front support     is substantially flexible along a majority of a length thereof. -   432. The seating arrangement of claim 431, further comprising:

a second support connect to the attachment point and to the seat portion of the support shell.

-   433. The seating arrangement of claim 432, wherein the second     support is substantially rigid. -   434. The seating arrangement of claim 432, further comprising:

a stop member configured to abut the second support element to limit a movement of the shell member between the upright and reclined position.

-   435. The seating arrangement of claim 434, wherein the second     support element includes a hollow interior that receives the stop     member. -   436. The seating arrangement of claim 433, wherein the support     assembly includes a pneumatic height adjustment cylinder. -   437. The seating arrangement of claim 436, wherein the seating     arrangement comprises an office chair assembly. -   438. The seating arrangement of claim 424, further comprising:

a pneumatic height adjustment cylinder, where the front support is located forwardly of a connection point between the support assembly and the control member.

-   439. The seating arrangement of claim 424, further comprising:

a support assembly configured to abut a floor surface, where the attachment point is located rearwardly of a connection point between the support assembly and the control member.

-   440. The seating arrangement of claim 424, further comprising:

a support assembly configured to abut a floor surface, where at least one of the multiple flex regions is located forwardly of a connection point between the support assembly and the control member.

-   441. The seating arrangement of claim 424, wherein at least one of     the of the multiple flex regions is located rearwardly of the     attachment point. -   442. The seating arrangement of claim 424, wherein at least one of     the multiple flex regions includes an area of reduced relative     thickness. -   443. The seating arrangement of claim 424, wherein the support shell     is an integral, one-piece component. -   444. The seating arrangement of claim 424, wherein the front support     is substantially flexible along a majority of a length thereof. -   445. The seating arrangement of claim 424, further comprising:

a second support connect to the attachment point and to the seat portion of the support shell.

-   446. The seating arrangement of claim 445, wherein the second     support is substantially rigid. -   447. The seating arrangement of claim 445, further comprising:

a stop member configured to abut the second support element to limit a movement of the shell member between the upright and reclined position.

-   448. The seating arrangement of claim 447, wherein the second     support element includes a hollow interior that receives the stop     member. -   449. The seating arrangement of claim 424, wherein the seating     arrangement comprises an office chair assembly. -   450. A seating arrangement, comprising:

a support shell comprising:

-   -   a back portion with an upper edge of a first width and a lumbar         region of     -   a second width;     -   a seat portion with a front edge of a third width; and     -   a transition portion, positioned between the chair back and         chair seat portions, of a fourth width;

an upholstered cover comprising a similar first width, second width, third width, and fourth width;

a support assembly; and

a control member comprising a front support and a rear support and configured to allow the support shell to move between an upright and a reclined position, the control member coupled to the support shell through the front and rear supports and having a fifth width adjacent the rear support; and

wherein at least one of the first width, the second width, and the third width is greater than the fourth width, and the fourth width is greater than the fifth width.

-   451. The seating arrangement of claim 450, wherein the third width     is greater than the second width. -   452. The seating arrangement of claim 451, wherein the second width     is greater than the first width. -   453. The seating arrangement of claim 452, wherein the first width     is greater than fourth width. -   454. The seating arrangement of claim 453, wherein the support shell     is an integral, single-piece. -   455. The seating arrangement of claim 454, wherein the control     member is an integral, single-piece. -   456. The seating arrangement of claim 455, wherein the seating     arrangement comprises an office chair assembly. -   457. The seating arrangement of claim 450, wherein the second width     is greater than the first width. -   458. The seating arrangement of claim 450, wherein the first width     is greater than fourth width. -   459. The seating arrangement of claim 450, wherein the support shell     is an integral, single-piece. -   460. The seating arrangement of claim 450, wherein the control     member is an integral, single-piece. -   461. The seating arrangement of claim 450, wherein the seating     arrangement comprises an office chair assembly. -   462. A seating arrangement, comprising:

a shell member that includes a seat portion configured to support a user, a back portion extending generally upward from the seat portion and movable between an upright position and a reclined position, and a transition portion located between the seat portion and the back portion, wherein at least a portion of the back portion, at least a portion of the seat portion and at least a first portion of the transition portion comprises a first thermoplastic polymer having a first flexibility, and wherein at least a second portion of the transition portion comprises a second thermoplastic polymer have a second flexibility that is greater than the first flexibility.

-   463. The seating arrangement of claim 462, wherein the first portion     and the second portion at least partially overlap one another. -   464. The seating arrangement of claim 463, wherein the first portion     includes at least one aperture extending therethrough. -   465. The seating arrangement of claim 464, wherein the second     portion is over-molded onto the first portion. -   466. The seating arrangement of claim 465, the transition portion is     arcuately shaped. -   467. The seating arrangement of claim 466, wherein the transition     portion has a forwardly-facing arcuate shape taken along a lateral     cross-section of the transition portion, and wherein the transition     portion has a forwardly-facing arcuate shape take along a vertical     cross-section of the transition portion. -   468. The seating arrangement of claim 467, wherein the first     thermoplastic polymer comprises at least one of polyethylene     terephthalate and polybutylene terephthalate. -   469. The seating arrangement of claim 468, wherein the second     thermoplastic polymer comprises a thermoplastic polyolefin. -   470. The seating arrangement of claim 469, further comprising:

a structural reinforcement member aligned with the transition portion of the shell member, where the structural reinforcement member structurally reinforces the shell member as the back portion moved between the upright and reclined positions.

-   471. The seating arrangement of claim 470, wherein the structural     reinforcement member has a forwardly-facing concave shape taken     along a vertical cross-section thereof. -   472. The seating arrangement of claim 471, wherein the structural     reinforcement member comprises a metal. -   473. The seating arrangement of claim 472, wherein the seating     arrangement comprises an office chair assembly. -   474. The seating arrangement of claim 462, wherein the first portion     includes at least one aperture extending therethrough. -   475. The seating arrangement of claim 462, wherein the second     portion is over-molded onto the first portion. -   476. The seating arrangement of claim 462, the transition portion is     arcuately shaped. -   477. The seating arrangement of claim 462, wherein the transition     portion has a forwardly-facing arcuate shape taken along a lateral     cross-section of the transition portion, and wherein the transition     portion has a forwardly-facing arcuate shape take along a vertical     cross-section of the transition portion. -   478. The seating arrangement of claim 462, wherein the first     thermoplastic polymer comprises at least one of polyethylene     terephthalate and polybutylene terephthalate. -   479. The seating arrangement of claim 478, wherein the second     thermoplastic polymer comprises a thermoplastic polyolefin. -   480. The seating arrangement of claim 462, wherein the second     thermoplastic polymer comprises a thermoplastic polyolefin. -   481. The seating arrangement of claim 462, further comprising:

a structural reinforcement member aligned with the transition portion of the shell member, where the structural reinforcement member structurally reinforces the shell member as the back portion moved between the upright and reclined positions.

-   482. The seating arrangement of claim 481, wherein the structural     reinforcement member has a forwardly-facing concave shape taken     along a vertical cross-section thereof. -   483. The seating arrangement of claim 481, wherein the structural     reinforcement member comprises a metal. -   484. The seating arrangement of claim 462, wherein the seating     arrangement comprises an office chair assembly.

In the foregoing description, it will be readily appreciated by those skilled in the art that modifications may be made to the described embodiments without departing from the concepts disclosed herein. Such modifications are to be considered as included in the following claims, unless these claims by their language expressly state otherwise. 

The invention claimed is:
 1. A seating arrangement, comprising: an upwardly extending back arrangement movable between an upright position and a reclined position; and a seat arrangement, comprising: a first link member extending substantially horizontally, the first link member having a forward portion and a rearward portion and configured to support a seated user thereon; a second link member spaced from the first link member; a third link member operably coupled to the forward portion of the first link member and to the second link member, the third link member being substantially flexible along a majority of a length thereof; and a fourth link member operably coupled to the rearward portion of the first link member and to the second link member, the fourth link member being substantially rigid along a majority of a length thereof; and wherein the first link member, the second link member, the third link member and the fourth link member cooperate to form a linkage arrangement, and wherein the seat arrangement moves in a rearward direction as the back arrangement is moved between the upright position and the reclined position.
 2. The seating arrangement of claim 1, further comprising: an integral, single-piece first shell member that includes a first portion of the back arrangement and the first link member of the seat arrangement.
 3. The seating arrangement of claim 2, further comprising: an integral, single-piece second shell member that includes a second portion of the back arrangement and the second link member of the seat arrangement.
 4. The seating arrangement of claim 3, wherein the first shell member includes an arcuately-shaped first transition region located between the first portion of the back arrangement and the first link member.
 5. The seating arrangement of claim 4, wherein the second shell member includes an arcuately-shaped second transition region located between the second portion of the back arrangement and the second link member.
 6. The seating arrangement of claim 5, wherein the third link member and the second shell member are an integral, single-piece.
 7. The seating arrangement of claim 1, wherein the first shell member comprises a poly material.
 8. The seating arrangement of claim 2, wherein the second shell member comprises carbon fiber.
 9. The seating arrangement of claim 1, wherein the fourth link comprises carbon fiber.
 10. The seating arrangement of claim 1, wherein the first link includes a forward portion, a rearward portion, and at least one laterally-extending relief located between the forward portion and the rearward portion, such that the rear portion of first link rotates at a different rate than the forward portion of the first link as the back arrangement is moved from the upright position to the reclined position.
 11. The seating arrangement of claim 10, wherein the rear portion of the first link rotates at a greater rate of rotation than the second portion of the first link as the back arrangement is moved between the upright position and the reclined position.
 12. The seating arrangement of claim 1, wherein the linkage arrangement comprises a four-bar arrangement.
 13. The seating arrangement of claim 1, wherein the seating arrangement comprises an office chair assembly.
 14. A seating arrangement, comprising: a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the first portion configured to support a seated user and including a flexible tab member configured to flex independently from a majority of the first shell member, and the second portion configured to move between an upright position and a reclined position; a second shell member having a horizontally extending first portion at least partially spaced from the first portion of the first shell member; and a first support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member, wherein the support member is attached to the tab member of the first portion of the first shell member, and where the tab flexes a greater amount than the majority of the first portion of the first shell member as the second portion of the first shell member is moved from the upright position to the reclined position.
 15. The seating arrangement of claim 14, wherein the tab includes a portion having a reduced thickness that is less than a thickness of the majority of the first portion of the first shell member.
 16. The seating arrangement of claim 15, wherein the portion of the tab having reduced thickness is located forward of a location at which the first support member is connected to the tab.
 17. The seating arrangement of claim 14, wherein the first support member is flexibly resilient.
 18. The seating arrangement of claim 14, further comprising: a second support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member, such that the first portion of the first shell member, the first portion of the second shell member, the first support member and the second support member cooperate to form a four-bar linkage.
 19. The seating arrangement of claim 18, wherein the second support member is substantially rigid.
 20. The seating arrangement of claim 18, wherein the second support member is located rearward of the first support element.
 21. A seating arrangement, comprising: a flexibly resilient first shell member having a horizontally-extending first portion and a second portion extending upwardly from the first portion, the second portion of the first shell member movable between an upright position and a reclined position; a flexibly resilient second shell member having a horizontally extending first portion at least partially spaced from the first portion of the first shell member, and a second portion extending upwardly from the first portion of the second shell member and at least partially spaced from the second portion of the second shell member, wherein the first portion of the second shell member includes a reduced thickness region where the thickness of the first portion of the second shell member is less than a thickness of the a majority of the first portion of the second shell member; a flexibly resilient first support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member, where the first support member includes a reduced thickness region where the thickness of the first support member is less than a thickness of a majority of the first support member; and a second support member extending between and supporting the first portion of the first shell member from the first portion of the second shell member such that the first portion of the first shell member, the first portion of the second shell member, first support member, and the second support member cooperate to form a linkage arrangement; and wherein the reduced thickness region of the first portion of the second shell member flexes more than the majority of the first portion of the second shell member and the reduced thickness region of the first support member flexes more than the majority of the first support member as the second portion of the first shell member moves from the upright to the reclined positions.
 22. The seating arrangement of claim 21, wherein the reduced thickness region of the first support member is located proximate a lower end of the first support member.
 23. The seating arrangement of claim 21, wherein the reduced thickness region of the first section of the second shell member is located forward of a location at which the second support member connects to the second shell member.
 24. The seating arrangement of claim 21, wherein the second support member is substantially rigid.
 25. The seating arrangement of claim 21, wherein the first portion of the first shell member includes a flexible tab member configured to flex independently from the majority of the first shell member, the first support member is connected to the tab, and wherein the tab flexes a greater amount than the majority of the first portion of the first shell member as the second portion of the first shell member is moved from the upright position to the reclined position.
 26. The seating arrangement of claim 25, wherein the tab includes a portion having a reduced thickness that is less than a thickness of the majority of the first portion of the first shell member.
 27. The seating arrangement of claim 26, wherein the portion of the tab having reduced thickness is located forward of a location at which the first support member is connected to the tab.
 28. The seating arrangement of claim 21, wherein the linkage arrangement comprises a four-bar linkage arrangement.
 29. The seating arrangement of claim 21, wherein the seating arrangement comprises an office chair assembly. 